Free Software for Self-Hosted
bbPress
bbPress is forum software from the creators of WordPress. With bbPress you can quickly setup a forum for asyncronous discussion and subscriptions for your WordPress-powered site.
Supabase
Supabase is a free and open-source self-hosted and SaaS provided alternative to Firebase. With Supabase you can add a realtime REST API to a PostgreSQL without writing a single line of code.
Mailpile
Mailpile is an effort to reclaim private communication on the Internet. A project to rescue our personal lives from the proprietary cloud and prevent our conversations from being strip-mined for corporate profit and government surveillance. With Mailpile you can take e-mail back and make it yours.
Objection.js
Objection.js is an ORM (Object Relational Mapper) built on top of knex for Node.js. Objection.js aims to stay out of your way and make it as easy as possible to use the full power of SQL and the underlying database engine while still making the common stuff easy and enjoyable. Even though ORM is the best commonly known acronym to describe objection, a more accurate description is to call it a relational query builder. With Objection.js you get all the benefits of an SQL query builder but also a powerful set of tools for working with relations.
Hasura
Hasura is a software development tool that lets you build real-time GraphQL APIs for a PostgreSQL database. The software is free and open source, while enterprise features are provided at a cost. Hasura is perfect for building GraphQL powered microservices and 3factor applications.
Cycle.js
Cycle.js is a functional and reactive JavaScript framework used to write predictable code. Cycle’s core abstraction is your application as a pure function main() where inputs are read effects (sources) from the external world and outputs (sinks) are write effects to affect the external world. These I/O effects in the external world are managed by drivers: plugins that handle DOM effects, HTTP effects, etc.
Scalatra
Scalatra is a simple, accessible and free web micro-framework. It combines the power of the JVM with the beauty and brevity of Scala, helping you quickly build high-performance web sites and APIs.
Drupal Commerce
Drupal Commerce is a free and open-source eCommerce module for Drupal. With Drupal Commerce, people can start selling products from their Drupal-powered websites by simply installing and configuring the module. Drupal Commerce provides extra extensions that can be used to further improve and extend on the features of the module.
Ember.js
Ember.js is a productive, battle-tested JavaScript framework for building modern web applications. It includes everything you need to build rich UIs that work on any device. With Ember.js you can create client side JavaScript applications with a complete solution which contains data management and an application flow. Ember.js is developed and released as free and open source software under the MIT License.