Free Software for Self-Hosted
Apache Camel
Apache Camel is an open-source integration framework that empowers you to quickly and easily integrate various systems consuming or producing data.
Actix.rs
A powerful, pragmatic, and extremely fast web framework for Rust. With Actix.rs you can forget about stringly typed objects, from request to response, everything has types. Actix provides a lot of features out of box. HTTP/2, logging, etc and is easily extensible. Allowing you to create your own libraries that any Actix application can use.
Deployd
Deployd is a free and open-source web development tool for Node.js that makes building APIs simple by providing important ready-made functionality out-of-the-box. Features provided by Deployd can demands of complex applications and can be further customized with JavaScript Events.
MemSQL
MemSQL is a free and open-source all-in-one relation database management system. The database lends itself for operational analytics and AI/ML-powered applications that requires fast data ingest, high performance queries and elastic scaling. MemSQL supports ANSI SQL and blended workloads, commonly referred to as translytical, HTAP, HOAP, and ATP workloads. The developer MemSQL Inc, also provides commercially hosted version of the database called MemSQL Helios, a cloud database-as-a-service.
TiddlyWiki
TiddlyWiki is a personal wiki and a non-linear notebook that provides an interactive way to manipulate and structure data for web consumption. The free and open source application is written as an SPA (Single Page Application) with JavaScript by Jermolene. TiddlyWiki is designed from the ground up to easy to customize and re-shape depending on your use-case, while also providing tools that can be used to split up and reuse content.
Pyramid
Pyramid is a web framework written in Python that makes it easy to write applications for the web. With Pyramid, you can start small and finish big. Pyramid offers many features suited for writing both simple and complex software, while providing clear structure as your application grows. Since 1995, the Pyramid team has stayed devoted to professional craftmenship with a deep commitment to quality, which is seen throughout the Pyramid framework and the developer experience and workflow it provide for developers. Pyramid is released free and open-source under the Zope Public License (ZPL) Version 2.1.
PostgREST
PostgREST is a standalone web server and development tool that automatically turns your PostgreSQL database into a RESTful API.
Calendso
Calendso is a free and open source self-hosted Calendly alternative. Calendso is white-label by design and can be hosted on-premise or can be hosted and managed by Calendso for a monthly charge. The calendar software is built to be API-driven and ready to be deployed on your own domain and does not add hurdles to the self-hosting process to favor the managed solution. Calendso provides modern features and comes with integrations for popular third-party services like Salesforce, Zapier, HubSpot and many more. While also allow you and your company to build custom integrations for any platform out there, and integrate seamlessly with your existing workflow.
Ionic Framework
Ionic is an open-source mobile app development framework that makes it easy to build high quality native and progressive web applications. The Ionic Framework takes advantage of power and flexibility of Angular to enable developers to build production-ready applications in a way that feels familiar. The Ionic Framework is released free and open-source under the MIT License, but the company behind the framework also provides the Ionic Enterprice Platform which enables large organization to launch enterprice-grade applications faster to the cloud.
Sinatra
Sinatra is a free and open source DSL library for quickly creating web applications in Ruby with minimal effort. Sinatra is loved by many due to its simplicity and ease-of-user. For Ruby developers, Sinatra is an alternative to web application frameworks like Ruby on Rails, Merb, Nitro, and Camping.