Self-hosted apps built with C++

llama.cpp

Local LLM Runners

High-performance LLM inference in plain C/C++

Replaces OpenAI API

Privacy-first desktop chat with local language models

Replaces ChatGPT

Fast C++ port of OpenAI Whisper speech recognition

Replaces Otter.ai, Google Speech-to-Text

Sunshine

Remote Access & VPN

Self-hosted game-stream host for Moonlight clients

Replaces NVIDIA GameStream, Parsec

qBittorrent

Media Servers

Bittorrent client that aims to be a good alternative to all other

Replaces µTorrent

A simple, high efficiency and real-time video server, supports RTMP,

KeePassXC

Password Managers

Cross-platform offline KeePass password manager

Replaces LastPass, 1Password

Cloud-native high-performance edge and service proxy

Replaces Nginx, HAProxy

MongoDB

Developer Tools & Git

MongoDB is an open-source NoSQL database

Typesense

Search Engines

Open-source typo-tolerant search engine optimized for speed

Replaces Algolia, Elasticsearch

Distribute and run LLMs with a single executable file

Replaces OpenAI API, ChatGPT

Kodi

Media Servers

Open-source home theater and media center

Replaces Plex

Open-source game streaming client for low-latency desktops

Replaces Parsec, Steam Remote Play

Firmware for controlling addressable LED strips

Replaces Philips Hue

ZeroTier

Remote Access & VPN

Global virtual network for connecting devices anywhere

Replaces Tailscale

Ceph

File Sync & Storage

Distributed object, block, and file storage platform

Replaces Amazon S3, Google Drive

Open-source remake of RollerCoaster Tycoon 2

Replaces RollerCoaster Tycoon

Transmission

Media Servers

Fast, Easy, and Free BitTorrent Client

Replaces µTorrent

Mobile shell with roaming and intermittent connectivity

Replaces SSH

Free and open-source geographic information system

Replaces ArcGIS

Watch files and trigger actions when they change

Replaces fswatch

Open-source voxel game engine and server

Replaces Minecraft

Open-source turn-based survival roguelike

Replaces NetHack

Markdown note-taking application built for programmers

Replaces Evernote, OneNote

Fast, low-footprint database for search

Replaces Elasticsearch, Algolia

Single-file local LLM runner for text and storytelling

Replaces ChatGPT

ESPHome

Home Automation

Configure ESP devices with simple YAML

Replaces SmartThings

Automatic license plate recognition library

Replaces Rekor Scout, Plate Recognizer

Self-hosted game and desktop streaming host

Replaces Steam Remote Play, Parsec

MMORPG server emulator for World of Warcraft

Replaces official WoW servers

Open-source Minecraft launcher for managing instances and modpacks

Replaces Official Minecraft Launcher, CurseForge app

Transparent file encryption for secrets stored in git

Replaces HashiCorp Vault, AWS Secrets Manager

Open-source cross-platform 2D and 3D game engine

Replaces Unity

Modernized Diablo engine with cross-platform multiplayer

Replaces Diablo original

Open-source MMORPG server framework for World of Warcraft

Replaces official WoW servers

OpenTTD

Game Servers

Open-source transport simulation game with servers

Replaces Transport Tycoon

Mumble

Chat & Communication

Low-latency, high-quality voice chat application

Replaces Discord, TeamSpeak

High-performance routing engine for OpenStreetMap

Replaces Google Directions API

Snapcast

Media Servers

Synchronized multi-room audio streaming player

Replaces Sonos

Stable Diffusion inference in plain C/C++

Replaces Midjourney

Free space exploration and trading game

Replaces Escape Velocity

High-performance, platform-neutral VNC implementation

Replaces RealVNC

Cutting-edge WebRTC SFU library for Node.js

Replaces Twilio Video

Multi-platform EPUB ebook editor

Replaces Adobe InDesign EPUB export

Turn-based fantasy strategy with multiplayer server

Replaces Heroes of Might and Magic

Open-source engine reimplementation for Morrowind

Replaces Morrowind original engine

Open-source routing engine with multimodal support

Replaces Google Directions API

Command-line task management done right

Replaces Todoist, Things

Plain-text accounting toolkit and CLI

Replaces QuickBooks, Quicken

Open-source engine for Heroes of Might and Magic III with multiplayer

Replaces Heroes of Might and Magic III original

Plain-text note taking with Markdown and Nextcloud sync

Replaces Evernote, OneNote

Piper

Home Automation

Fast, local neural text-to-speech for voice assistants

Replaces Amazon Polly, Google TTS

Desktop client for Jellyfin with native playback

Replaces Plex Desktop

Lightweight, extensible Minecraft-compatible game server

Replaces Minecraft Server, Spigot

Free 3D kart racing game with online servers

Replaces Mario Kart

Modern VNC server with a browser-based client

Replaces TightVNC, RealVNC

Librum

E-books & Media Library

Modern e-book reader with self-hostable sync

Replaces Kindle, Goodreads

Peer-to-peer encrypted messaging and calls over Tox

Replaces Skype, WhatsApp

Terminal-based music player with a built-in streaming server

Replaces Plexamp

AI-native database for embedding and hybrid search

Replaces Pinecone, Elasticsearch

Self-hosted local Telegram Bot API server

Bridge for RF, IR, BLE, and sensors to MQTT

Replaces SmartThings Hub

Lightweight motion-detection video surveillance daemon

Replaces Nest Cam

Music player and collection organizer with Subsonic support

Replaces iTunes, Clementine

Open-source engine for hosting real-time strategy game servers

Replaces Total Annihilation

Open-source 3D real-time strategy game

Replaces Command & Conquer

Toolkit for rendering raster map tiles from spatial data

Replaces Google Maps, Mapbox

Hierarchical rich-text and code note-taking application

Replaces OneNote, Evernote

Terminal RSS and Atom feed reader for text consoles

Replaces Feedly

Remote terminal that survives network changes

Replaces Mosh

Official desktop sync client for Nextcloud

Replaces Dropbox, OneDrive

Ambient lighting software for screens and media

Replaces Philips Hue Sync, Govee Immersion

Lightweight home automation system

Replaces SmartThings

Multifunctional firmware for ESP8266 and ESP32 sensors

Replaces Tuya

Open-source engine for the S.T.A.L.K.E.R. games

Replaces original X-Ray Engine

Performance-focused fork of llama.cpp with new quant types

Replaces OpenAI API

Streaming Server with Sub-Second Latency

Classic-style 2D side-scrolling platform game

Replaces Super Mario Bros

Caching and forwarding HTTP web proxy

Replaces Cloudflare Gateway

Open-source real-time strategy and economy game

Replaces The Settlers

Interactive whiteboard software for teaching

Replaces SMART Notebook, Promethean

Tray application and CLI for managing Syncthing

Replaces Resilio Sync

Cross-platform Qt GUI for managing rclone remotes

Replaces Mountain Duck, Cyberduck

Self-hostable image proxy and on-the-fly resizing service

Replaces Cloudinary, imgix

Free historical real-time strategy game

Replaces Age of Empires

Cross-platform desktop feed reader with plugin support

Replaces Feedly

Daemon to remotely play music, stream music, handle and organize

Thinking notebook and Markdown knowledge base

Replaces Evernote, OneNote

Retro 2D multiplayer shooter with servers

Replaces Worms, Soldat

Desktop Matrix client with native Qt interface

Replaces Slack, Discord

Open firmware for LED matrix smart home displays

Replaces LaMetric Time

Encrypted filesystem for safely storing files in the cloud

Replaces Boxcryptor

Free cross-platform personal finance manager

Replaces Quicken, Mint

Scalable monitoring system that watches hosts and networks

Replaces SolarWinds, PRTG

Containerized cloud gaming and remote desktop platform

Replaces GeForce Now, Parsec

Free city-building simulation game

Replaces SimCity

Advanced and flexible IRC bouncer

Replaces IRCCloud

Secured and decentralized communication system

Fast, scalable caching proxy server

Replaces Varnish, Squid

Free remote desktop and file transfer toolkit

Replaces TeamViewer, AnyDesk

Open-source reimplementation of Chris Sawyer's Locomotion

Replaces Chris Sawyer's Locomotion original

Open-source space adventure and trading simulator

Replaces Elite, Frontier

Zigbee gateway software for ConBee and RaspBee

Replaces Philips Hue Bridge

Add network play functionality to Rockstar North's Grand Theft Auto

Lightweight music server with Subsonic API support

Replaces Spotify

Competitive top-down shooter blending Counter-Strike with Hotline

Folder comparison and synchronization tool with a GUI

Replaces Dropbox, rsync

Command-line time tracking with powerful reporting

Replaces Toggl

Hot online backup for MySQL and MariaDB

Replaces MySQL Enterprise Backup

Gerbera

Media Servers

UPnP media server for streaming to DLNA devices

Replaces Plex

InspIRCd

Chat & Communication

Modular C++ Internet Relay Chat daemon

Replaces Slack, Discord

Backup Archiving Recovery Open Sourced

Replaces Veeam, CommVault

Self-hostable open-source educational programming game

Replaces Commercial programming games

Open-source voxel FPS compatible with Ace of Spades servers

Replaces Ace of Spades

Open-source interpreter for RPG Maker 2000 and 2003 games

Replaces RPG Maker RTP runtime

digiKam

Photo Management

Professional photo management with advanced metadata tools

Replaces Adobe Lightroom, Google Photos

Btrfs snapshot management tool with rollback

Replaces Time Machine

Liquid Network full node

Server modification platform for Source engine dedicated servers

Replaces Vanilla Source dedicated server

Free FPS/RTS hybrid game with a self-hostable dedicated server

Replaces Tremulous

Open-source cross-platform RSS and Atom news aggregator

Replaces Feedly

Performant indexes and search for large text collections

Replaces Elasticsearch

Open-source turn-based space empire strategy game

Replaces Master of Orion

Open hardware and software for touchscreen controls

Replaces Nextion HMI

Kiwix

Wikis & Documentation

Offline reader for Wikipedia and other knowledge

Replaces Wikipedia online

Read-only query API for OpenStreetMap data

Replaces Google Places API

Mature open-source probabilistic search engine library

Replaces Elasticsearch

Multiplayer server for The Elder Scrolls III via OpenMW

Replaces Morrowind single-player

Engine and editor for creating point-and-click adventure games

Replaces Visionaire Studio

Cooperative platformer based on Teeworlds

Replaces Teeworlds

Open-source server emulator for Final Fantasy XIV

Replaces official FFXIV servers

Open-source flight simulator with multiplayer

Replaces Microsoft Flight Simulator, X-Plane

Open-source engine for the Marathon trilogy with multiplayer

Replaces Marathon original

Community patchpack extending OpenTTD multiplayer servers

Replaces Transport Tycoon

Distributed IRC client with an always-on core

Replaces Slack

Open-source ERP for accounting, sales and inventory

Replaces SAP, Oracle SCM

Run your personal node powered by Bitcoin Knots

Open-source 2D action-RPG game engine

Replaces RPG Maker

Open-source city building and management game

Replaces SimCity

Open-source internet-connected irrigation controller

Replaces Rachio

Continued MaNGOS World of Warcraft server emulator

Replaces official WoW servers

Fast-paced open-source arena first-person shooter

Replaces Quake, Unreal Tournament

Open-source SIP voice, video, and messaging client

Replaces Skype, Zoom

A fast and nimble Electrum Server

Open-source dungeon-keeper-style real-time strategy game

Replaces Dungeon Keeper

Open-source video surveillance recording engine

Replaces Milestone XProtect, Blue Iris

Open-source MMORPG engine and game framework

Replaces World of Warcraft

Transport and gateway framework for messaging networks

Replaces Bitlbee

Open-source 3D real-time strategy game

Replaces Age of Empires, Warcraft III

Enterprise-grade network and infrastructure monitoring

Replaces SolarWinds, PRTG

Open-source multiplayer action and tactics game

Replaces Clonk

Self-hosted name registry and bridge for the Jami network

Replaces Skype, Zoom

High-performance Matrix homeserver written in C++

Replaces Slack, Discord

IRC services suite for nickname and channel registration

Replaces Slack

Next-generation successor to the Motion surveillance software

Replaces Blue Iris, ZoneMinder

Lightweight and modular continuous integration service

Replaces Jenkins

Apache module and renderd for serving OSM raster tiles

Replaces Mapbox Tiles, Google Maps tiles

Full-text desktop and server search for your documents

Replaces Google Desktop

Graphic art and office suite from KDE

Replaces Microsoft 365

Open-source IP camera surveillance and NVR application

Replaces Milestone XProtect

Smart manager for hierarchical notes and snippets

Replaces Evernote, OneNote

Cross-platform desktop front end for Tarsnap backups

Replaces Backblaze

3D Tron-style lightcycle multiplayer game

Replaces Tron

Personal finance manager for the KDE desktop

Replaces Quicken, Microsoft Money

Disk Archive tool for full and incremental backups

Replaces tar

Integrated personal information manager for KDE

Replaces Microsoft Outlook

Personal finance manager for the KDE desktop

Replaces Quicken

Feature-rich graphical client for the MPD music server

Replaces iTunes

Simple relay-only mail transfer agent

Replaces Sendmail

Complete, modular and scalable SIP server, includes a push gateway

Open-source reimplementation of Command & Conquer: Red Alert

Replaces Command & Conquer: Red Alert original

Open-source strategy game of defending Earth from aliens

Replaces XCOM

Terminal-based budgeting and expense tracker

Replaces YNAB, Mint

Open-source transport and economy simulation game

Replaces Transport Tycoon

XMPP to IRC gateway component

KDE backup scheduler for personal files

Replaces Time Machine

Calendar and scheduling component of KDE Kontact

Replaces Outlook Calendar

Open-source collaboration platform with Outlook support

Replaces Microsoft Exchange

Fully distributed, peer-to-peer encrypted communication

Replaces Skype, Zoom

Collabora Online Development Edition (CODE) is a powerful

Instant messaging and collaboration tool with private and group chat

Transit class4 softswitch(SBC) with integrated billing and routing

A small and easy to configure SMTP and POP3 server for Windows