BEST OPEN SOURCE SOFTWARE TOOLS

All-in-one mail server that implements SMTP (both MTA and MX) and IMAP. Replaces Postfix, Dovecot, OpenDKIM, OpenSPF, OpenDMARC with single daemon

Push notifications to phone or desktop using HTTP PUT/POST, with Android app, CLI and web app, similar to Pushover and Gotify.

Simple calendar and contact server with extremely low administrative overhead

Self-hosted authentication for syncing Firefox data across devices

StackStorm (aka _IFTTT for Ops_) is event-driven automation for auto-remediation, security responses, troubleshooting, deployments, and more. Includes rules engine, workflow, 160 integration packs with 6000+ actions and ChatOps

No-code business automation tool like Zapier or Tray. For example, you can send a Slack notification for each new Trello card

Lightweight, customizable and remotely manageable downloader for 1-click-hosting sites like rapidshare.com or uploaded.to

Global HR Portal

Simple content platform to manage any structured content

Create a community, where your users can suggest ideas and get questions answered. And have friendly open-ended discussions and chat (Slack/StackOverflow/Discourse/Reddit/Disqus hybrid)

Knowledge-based community software. You can use it to quickly build your Q&A community for product technical support, customer support, user communication, and more

Distributed IRC client, meaning that one (or multiple) client(s) can attach to and detach from a central core.

Browse, search, and participate in GNU Mailman 3 web archives

Bookmark and archive manager to store your useful links

Employee onboarding platform that allows you to provision user accounts and create sequences with todo items, resources, text/email/Slack messages, and more! Available as a web portal and Slack bot

Robust and modular repository system for the management and dissemination of digital content especially suited for digital libraries and archives, both for access and preservation

Fast and lightweight DNS proxy as ad-blocker for local network with many features (alternative to Pi-hole)

Manage databases, supports PostgreSQL, MySQL, SQLite and more. A web/hosted version of DBeaver

A secure enterprise CMS for complex websites and intranets

Create complex narratives and share rich collections, adhering to Dublin Core standards with Omeka on your server, designed for scholars, museums, libraries, archives, and enthusiasts

Online lab notebook for research labs. Store experiments, use a database to find reagents or protocols, use trusted timestamping to legally timestamp an experiment, export as pdf or zip archive, share with collaborators…

Content Management Tool, which strives to be as simple and straightforward as possible

Web-based event management, including running a Call for Papers, reviewing submissions, and scheduling talks. Exports and imports for various related tools

Scalable and high performance web conferencing system