Riot allows teams to communicate across a wide range of collaboration apps. If some team members use Riot while others use IRC, Slack or Gitter, Riot will allow these team members to seamlessly work together. Riot offers the richest network of communication bridges. Riot lets you run your own server, and provides users and teams with the most advanced crypto ratchet technology available today for a decentralized secure Internet. Riot is entirely open source: all the code is published on GitHub (Apache License) for anyone to see and extend. This means teams can customize or contribute to the code and everyone can benefit from the speed of community innovation. Riot is built on top of Matrix.

BounCA is a tool to manage your personal SSL certificates and authorities in a central and easy to use interfaces. It provides an easy accessible web interface to manage your openssl based root authority without the hassle of knowing all the arguments of the command line tools. BounCA is also an administration tool for all your signed certificates and revocation lists. Create and manage your own X.509 / PKI key and certificate trust infrastructure in a couple of minutes.

YunoHost is a server operating system aiming to make self-hosting accessible to everyone.

A Hazzle-Free Way to Self-Host Google Fonts

Huginn is a system for building agents that perform automated tasks for you online. They can read the web, watch for events, and take actions on your behalf. Huginn's Agents create and consume events, propagating them along a directed graph. Think of it as a hackable Yahoo! Pipes plus IFTTT on your own server. You always know who has your data. You do.

Mailtrain is a self hosted newsletter application built on Node.js (v5+) and MySQL (v5.5+ or MariaDB). Mailtrain supports subscriber list management, list segmentation, custom fields, email templates, large CSV list import files, etc.

A painless self-hosted Git service.

Monitor the accessibility of your websites with pa11y-dashboard, and protect against accessibility errors creeping into your codebase.

Kinto is a lightweight JSON storage service with synchronisation and sharing abilities.

Maily Herald is a Ruby on Rails engine that helps you send and manage your mailings.
Think of Maily as a self-hosted Mailchimp® you can easily integrate with your site.

Mattermost is a self-hosted solution for bringing all your team communication to one place, and making it searchable and accessible anywhere

Powerful slack-like open source group chat

A collection of the best open data sets and open-source tools for data science, wrapped in an easy-to-use REST/JSON API with command line, Python and Javascript interfaces. Available as a self-contained Vagrant VM or EC2 AMI that you can deploy yourself.

The Radicale Project is a complete CalDAV (calendar) and CardDAV (contact) server solution.

Prometheus is an open-source systems monitoring and alerting toolkit originally built at SoundCloud. Prometheus's main features are:

• a multi-dimensional data model (time series identified by metric name and key/value pairs)
• a flexible query language to leverage this dimensionality
• no reliance on distributed storage; single server nodes are autonomous
• time series collection happens via a pull model over HTTP
• pushing time series is supported via an intermediary gateway
• targets are discovered via service discovery or static configuration
• multiple modes of graphing and dashboarding support

A self-hosted, web-based application for stream your music, everywhere.

A project to help users self-host their websites, email, files and more. Decentralize your web and reclaim your privacy rights while keeping the conveniences you need.

Memor is a bookmark manager.

Web based code review and project management for Git based projects.

poche is a self hosted read-it-later app. unlike to other services, poche is free and open source.