Free Software for Self-Hosted
GitLab
A web-based tool for DevOps lifecycle management and source code hosing. GitLab, much like GitHub use the open-source technology Git for repository management and code reversion. On top of that GitLab provide extra services like issue-tracking, wiki and CI/CD pipelines for code deployment. The main difference between GitLab and GitHub is that GitLab is open-source and the whole platform can be self-hosted on your own server. GitLab also provides the same hosted repository solutions provided by GitHub.
GitBucket
GitBucket is a free and open-source Git platform built on the JVM. GitBucket is written in Scala and released under the Apache License Version 2.0.
D3.js
With D3.js developers can produce dynamic, interactive data visualizations in web browsers. It's a free and opne-source JavaScript library that combines Scalable Vector Graphics, HTML5, and Cascading Style Sheets standards. The library gives developers the full capability of modern browsers and puts a strong emphasis on web standards.
Gotham.rs
Gotham.rs is a flexible web framework written in Rust, it promotes stability, safety, security and speed.
Simple URLs
Simple URLs is a complete free and open-source URL management plugin for WordPress that allows you create, manage, and track outbound links from your site by using custom post types and 301 redirects.
WampServer
WampServer is a pre-configured web development stack for the Windows operating system. With WampServer it easy to manage a local web development environment that includes the Apache Web Server, the programming language PHP, combined with a MySQL or MariaDB database. WampServer comes with an installer that automatically installs everything you need to get started with the stack. Which makes WampServer a perfect choice for developer looking to quickly setup a local WAMP stack.
NativeScript
NativeScript is an open-source framework that you can use to develop mobile apps on the Apple iOS and Android platforms. The framework is developed and released by Progress, a software development company providing a wide range of SaaS-based products. NativeScript apps are built using JavaScript, or by using any programming language that transpiles to JavaScript, such as TypeScript.
Vizzu
Vizzu is a free, open-source Javascript/C++ library utilizing a generic dataviz engine that generates many types of charts and seamlessly animates between them. It can be used to create static charts but more importantly it is designed for building animated data stories and interactive explorers as Vizzu enables showing different perspectives of the data that the viewers can easily follow due to the animation.
Laravel Livewire
Laravel Livewire is a free and open-source, full-stack framework for Laravel that makes building dynamic interfaces simple. The framework allows you to build modern web applications faster, without leaving the comfort of Laravel. In a world where building modern web applications has become significantly more complex over time, Laravel Livewire can facilitate some of the functionallity brough about by frameworks like Angular, React, Vue and Svelte, without having to write JavaScript.
SvelteKit
SvelteKit is a free and open-source framework used to create SSR, Static and Serverless web applications with Svelte. SvelteKit aims to replace Sapper and in the process unify the eco-system and have a single way to start building apps with Svelte. This will simplify on-boarding, and reduce maintenance and support burden for the core developers. SvelteKit fully embraces the serverless paradigm and has support for all the major serverless providers. Under the hood, SvelteKit uses Snowpack in development and compiles and hot reloads your code near instantly, making it an extremely pleasant developer experience.