Free Software for Self-Hosted

ArchiveBox

ArchiveBox is a free and open source, self-hosted web archive. With ArchiveBox, you can takes a list of URLs that you want to archive, and creates a local, static, browsable HTML clone of the content from those websites. ArchiveBox supports archiving of HTML, JavaScript, PDF, images and other media files.

Filestash

Filestash is a free and open-source Dropbox-like file manager that can be used to manage data anywhere. Filestash allows you to bring your own backend or create your own by implementing a simple interface. Currently, Filestash works with Amazon S3, SFTP, FTP, FTPS, Minio, Backblaze, GIT, Github, Gitlab, WebDav, LDAP, CalDAV, CardDAV, Mysql, Dropbox, Google, Drive Gogs Gitea. Through Filestash intuitive interface you can manage photos and files and easily share then with friends and family via regular links or social accounts.

Koa

Koa is a free and open-source, expressive HTTP middleware framework for Node.js. Koa provides a great developer experience that makes writing web applications and APIs more enjoyable. Koa's middleware stack flows in a stack-like manner, allowing you to perform actions downstream then filter and manipulate the response upstream. Only methods that are common to nearly all HTTP servers are integrated directly into Koa's small codebase. This includes things like content negotiation, normalization of node inconsistencies, redirection, and a few others.

Simple Machines Forum

Simple Machines Forum or SMF in short is a free and open-source forum software. SMF can be used to build your own online community that you self-host on a host of your choice. Simple Machines Forum comes packed with features for customization, extension and management of your community. The template engine puts you in control of the design of your community. The plugin architecture makes it easy to extend and provide further feautres though third-party built packages. 

Hexo

A fast, simple & powerful blog framework and static site generator powered by Node.js. With Hexo, you can quicly build static websites and blogs that generates at an increaible speed. Hexo generates hundreds of files per seconds and quickly builds and push your website to deployment, with a single command. You can have your site up and running in minutes on well known hosts and platforms like GitHub Pages, Heroku, Digital Ocean and other platforms. The framework support all features of  GitHub Flavored Markdown and most Octopress plugins by default. Hexo is released free and open-source under the MIT License.

CakePHP

CakePHP is a free and open source web framework for the programming language PHP. With CakePHP you can with ease, develop, deploy and maintain web applcations. CakePHP provides a sound structure that allow you to create organized applications that can scale and adapt as your project grows. Out of the box, CakePHP provides features like bake script, a rich query API, short RL syntax, database support for MySQL, SQLite, PostgreSQL, SQL Server, Oracle and more. It also includes features that make you app easier to develop such as automatic code generation, database migrations, fast and flexible templating language, and localization.

KeystoneJS

Gatsby

Gatsby is a free and open source framework and site generator that helps developers to build blazing fast websites and apps. The framework is based on React and include a plugin ecosystem that can be used to extend the capabilities of Gatsby. With Gatsby you can pull data from headless CMSs, SaaS services, APIs, databases, even your file system with the help of GraphQL. If you are looking to build a fast website that scales with time, Gatsby might your best pick.

Flarum

A free and open-source modern forum software written in PHP. With Flarum you can eaisly setup your own discussion froum and host it online.

Twin

Twin blends the magic of Tailwind with the flexibility of css-in-js.