Self-hosted apps built with C

Nginx

Reverse Proxy & Gateways

High-performance web server and reverse proxy

Replaces Apache, IIS

Open-source firmware for ESP-based smart devices

Replaces Tuya Cloud

GoAccess

Monitoring & Status

Real-time web log analyzer and interactive viewer

Replaces Google Analytics

Fast, customizable static analysis for many languages

Replaces SonarQube, Snyk Code

Lightweight encrypted SOCKS5 proxy

Replaces commercial VPN proxies

Seafile

File Sync & Storage

High-performance file sync and share with block storage

Replaces Dropbox, Google Drive

OpenVPN

Remote Access & VPN

Robust and flexible open-source VPN solution

Replaces Cisco AnyConnect

Open-source TURN and STUN server for WebRTC

Emulate videogames system and play videogames through your web browser

Scalable web platform extending Nginx with Lua

Replaces Nginx

Free implementation of the Remote Desktop Protocol

Replaces Microsoft RDP

Multi-protocol VPN server from the University of Tsukuba

Replaces Cisco AnyConnect

Nginx-derived web server with extra features

Replaces Nginx

Open-source photography workflow and RAW developer

Replaces Adobe Lightroom

Share your terminal over the web

Replaces PuTTY

Local DNS server that picks the fastest results

Replaces Pi-hole, dnsmasq

Mosquitto

Home Automation

Lightweight MQTT message broker

Replaces SmartThings

General-purpose, lightweight, minimalist WebRTC Server

Lightweight and fast logs and metrics processor

Replaces Logstash

IPv4 over DNS tunnel solution, enabling you to start up a socks5 proxy

Layer-two peer-to-peer VPN

Replaces ZeroTier, Hamachi

HAProxy

Reverse Proxy & Gateways

Reliable, high-performance TCP/HTTP load balancer

Replaces F5 BIG-IP, AWS ELB

Lightweight HTTP and HTTPS forward proxy daemon

Replaces Squid

Dynamic application server and reverse proxy

Replaces Passenger, uWSGI

Tiny multi-protocol proxy server suite

Replaces Squid

Scalable software telephony platform

Replaces Twilio, Asterisk

Protocol multiplexer that shares one port between services

Replaces HAProxy

Emulator of classic x86 PCs for retro gaming and software

Replaces PCem

Reliable backup and restore solution for PostgreSQL

Replaces Veeam

Free desktop accounting for individuals and businesses

Replaces Quicken, QuickBooks

High-performance HTTP accelerator and caching proxy

Replaces Cloudflare, Squid

The world's most widely used web server

Replaces Nginx, IIS

Apache Guacamole

Remote Access & VPN

Clientless remote desktop gateway in your browser

Replaces TeamViewer, Citrix

WireGuard

Remote Access & VPN

Fast, modern, secure VPN tunnel

Replaces OpenVPN

OpenBSD load balancer and relay daemon

Replaces HAProxy, F5 BIG-IP

Feature-rich terminal email client

Replaces Microsoft Outlook

Asterisk

Chat & Communication

Open-source framework for building telephony systems

Replaces Avaya, Cisco Unified Communications

Tvheadend

Media Servers

TV streaming server and recorder for DVB and IPTV

Replaces TiVo, Cable DVR

Extensible terminal-based chat client

Replaces Slack

Lightweight system statistics collection daemon

Replaces Datadog Agent

Stream JPEG frames from webcams over HTTP

Replaces Webcam streaming services

High-performance logical backup tool for MySQL

Replaces mysqldump

Modular terminal IRC client with scripting

Replaces Slack

Willow

Self-Hosted AI

Open-source privacy-focused voice assistant hardware platform

Replaces Amazon Alexa, Google Assistant

Web-based terminal emulator for remote shell access

Replaces PuTTY

Modern IPsec-based VPN implementation

Replaces Cisco AnyConnect

High-performance SIP server for VoIP infrastructure

Replaces Twilio

Maintained Quake III Arena engine with dedicated server

Replaces Quake III Arena original

Peer-to-peer encrypted messaging protocol and core

Replaces Skype, Discord

Cross-platform note-taking app with a self-hosted server

Replaces Evernote, OneNote

FreeRADIUS

Identity & SSO

High-performance open-source RADIUS server

Replaces Cisco ISE

Parity-based backup for disk arrays of large files

Replaces unRAID parity

Drop-in nginx fork with extended features

Replaces nginx

OwnTone

Media Servers

Media server with AirPlay, Chromecast and Spotify support

Replaces Spotify, Apple Music

Turn your choice of Linux-capable hardware into an audio and video

Fast, modern spam filtering system

Centralized syslog server with real-time web UI

Tasmota-like firmware for non-ESP smart devices

Replaces Tuya Cloud

VPN daemon that builds an encrypted mesh network

Replaces Hamachi, ZeroTier

Open-source firmware for IP cameras and surveillance devices

Replaces Stock IP camera firmware

Industry classic host and service monitoring engine

Replaces SolarWinds, PRTG

Lightweight MJPEG streamer for USB and CSI cameras

Replaces mjpg-streamer

VNC server for wlroots-based Wayland compositors

Replaces TightVNC, RealVNC

Natural-language design system for interactive fiction

Replaces TADS

Free turn-based strategy game with a dedicated multiplayer server

Replaces Civilization

Terminal pastebin server powered by netcat

Replaces Pastebin.com, termbin

Console-based XMPP client inspired by irssi

Replaces Slack

SIP proxy/server for voice, video, IM, presence and any other SIP

DIY Bluetooth presence detection with ESP32 nodes

Replaces Life360

Lightning-fast tag-based file indexing and search engine

Replaces Recoll

Text-based calendar and scheduling application

Replaces Google Calendar

Terminal-based client for the Tox messaging network

Replaces Skype, WhatsApp

Dovecot

Mail Servers

Secure, high-performance IMAP and POP3 server

Replaces Microsoft Exchange

Open-source platform for publishing spatial data

Replaces ArcGIS Server, Google Maps Platform

Self-hosted store and access for location history

Replaces Google Location Sharing, Life360

Command-line RCON client for Minecraft servers

Replaces In-game server console

Lightweight multiplayer first-person shooter

Replaces Counter-Strike

Open-source Active Directory compatible domain controller

Replaces Active Directory, Windows Server

Open-source 2D space trading and combat game

Replaces Escape Velocity

Client-server backup for files and disk images

Replaces Carbonite

Scriptable IMAP mail filtering utility

Replaces Gmail filters

Linux Feed Reader for the GNOME desktop

Replaces Feedly, Google Reader

Fast, tag-based email indexing and search system

Replaces Gmail search

Minimalist ActivityPub server in C

Replaces Twitter, Mastodon

Open-source full-text search engine and column store

Replaces Elasticsearch

VNC server for real X11 displays

Replaces TightVNC, RealVNC

Fast web interface for Git repositories

Replaces GitHub

Flexible and widely deployed mail transfer agent

Replaces Microsoft Exchange

Maintained engine and server for Wolfenstein: Enemy Territory

Replaces Wolfenstein: Enemy Territory original

Fast-paced free arena first-person shooter

Replaces Quake, Unreal Tournament

Scalable IMAP and POP server for large deployments

Replaces Microsoft Exchange

IRC gateway to instant messaging networks

Replaces Pidgin

Streaming media server for internet radio broadcasts

Replaces Spotify

Distributed version control with built-in wiki and bug tracking

Replaces GitHub, Git

SSL VPN server compatible with AnyConnect clients

Replaces Cisco AnyConnect

Secure and simple SMTP server from OpenBSD

Replaces Sendmail, Postfix

Lightweight Unix IRC server that is easy to configure

Replaces Slack

Fast, secure and reliable mail transfer agent

Replaces Microsoft Exchange

Web front-end for the MPD music player daemon

Replaces Spotify

Standalone web-based MPD client without dependencies

Replaces Sonos app

Highly configurable open-source IRC server

Replaces Slack, Discord

Public domain streaming media server that works with any device

Network backup and restore program for Unix and Windows

Replaces CrashPlan

High-performance camera streaming for Raspberry Pi

Replaces mjpg-streamer

Lightweight C implementation of the XMPP server

Replaces Slack

Modular IRC services framework for large networks

Replaces Slack

OpenLDAP

Identity & SSO

The classic open-source Lightweight Directory Access Protocol server

Replaces Active Directory

IMAP and Maildir mailbox synchronizer

Replaces Outlook offline mode

Open-source Yu-Gi-Oh card game client with self-hostable servers

Replaces Yu-Gi-Oh Master Duel

Fast-paced real-time strategy game for the Linux terminal

Replaces commercial RTS games

Backup and restore solution for PostgreSQL

Replaces Veeam

Feature-rich terminal RSS and Atom feed reader

Replaces Feedly

Simple desktop calendar with CalDAV support

Replaces Google Calendar

Lightweight SMTP client for sending mail

Replaces Sendmail

Fetch and filter mail with a single configuration

Replaces fetchmail, procmail

Raspberry Pi motion-detection camera with web interface

Replaces Nest Cam

Advanced Maryland Automatic Network Disk Archiver

Replaces Veeam, CommVault

Tiny mail transfer agent for outbound delivery

Replaces Sendmail, Postfix

IRCv3 server daemon used by Libera.Chat

Replaces Slack, Discord

Free Quake III-style arena shooter with servers

Replaces Quake III Arena

IRC server daemon for large networks

Replaces Discord, Slack

Lightweight DLNA/UPnP media server daemon

Replaces Plex

Process supervision and self-healing system monitoring

Replaces Datadog

Stateless password manager that derives passwords on demand

Replaces 1Password, LastPass

piler

Mail Servers

Email archiving system with full-text search

Replaces Mimecast, Barracuda Archiver

Lightweight and fast GTK email client

Replaces Microsoft Outlook

Remote desktop access over SSH with NX technology

Replaces Citrix, VNC

Privacy-enhancing web proxy with content filtering

Replaces commercial ad-filtering proxies

Lightweight and stable IRC server daemon

Replaces Slack, Discord

Remote mail retrieval and forwarding utility

Replaces Gmail import

Minimalist Plex/Jellyfin alternative to stream video

Compiler for static blogs and websites written in C

Replaces Jekyll, Hugo

Wake On LAN Machine Manager based on network traffic

Network monitoring core based on the Nagios codebase

Replaces SolarWinds, PRTG

Lightweight personal accounting application

Replaces Quicken

Self-sovereign Bitcoin mining

DMARC policy enforcement filter for mail servers

Replaces Proprietary DMARC services

DKIM signing and verification filter for mail servers

Replaces Proprietary email security gateways

All-in-one groupware, mail and collaboration server

Replaces Microsoft Exchange, Microsoft 365

Fast Bayesian spam filter for mail systems

Replaces Proprietary spam gateways

Dedicated server engine for the Nexuiz arena shooter

Replaces Quake III Arena

Sieve mail filtering engine for Dovecot

Replaces Gmail filters

Lightweight reverse proxy and HTTPS load balancer

Replaces NGINX, HAProxy

IRC server daemon used by the Undernet network

Replaces Discord, Slack

Open-source 2D MMORPG with self-hosted servers

Replaces Ragnarok Online

Desktop synchronization client for Pydio Cells servers

Replaces Dropbox, OneDrive

Small POP3 client for retrieving mail

Replaces fetchmail

Integrated mail server with IMAP, POP, and webmail

Replaces Microsoft Exchange

Re-broadcast mDNS packets

Secure, fast, compliant, and very flexible web server that has been

Simple and lightweight web cloud storage

Cross-platform multimedia player client and server supporting most

Samba is the standard Windows interoperability suite of programs

Super-minimal pastebin and file upload service focusing on small

Software framework for decentralized, peer-to-peer networking

Message transfer agent (MTA)

A super-minimal link shortening service written in pure C, focusing