Free Software for Self-Hosted
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.
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.
KeystoneJS
KeystoneJS is an open source JavaScript & Node.js framework that make build database-driven websites and web applications. Under the hood, KeystoneJS uses the express.js web server framework, and a MongoDB database via the mongoose object modelling framework.
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.
Bitbucket
With Bitbucket developers and teams can collaborate better on software projects. BitBucket is a web-based version control repository hosting service owned by Atlassian. The software is a suite of tools built on-top of the free and open-source Git repoitory management and version control system. Bitbucket provides features that developers can use to build, test and deploy code with integrated CI/CD.
Foundation
Foundation is a free and open-source HTML & CSS framework that can be used to build and design websites and web applicaitons in a structured way.
Apache Airflow
Apache Airflow is a community created workflow management platform. The software is both free and open-source, and can be used to reduce complexity in organizations workflow. Apache Airflow is modular by nature, and has an architecture that makes it easy to customize to organizations specific needs. The software was was first developed at Airbnb to where it was used to programmatically author and schedule their workflows, allowing the organization to monitor them via the built-in Airflow dashboard.
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.
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.
AlaSQL
AlaSQL is a free and open-source lightweight client-side in-memory SQL database designed to work in browser and Node.js. The database is written in JavaScript and does not use the browsers WebSQL database. The AlaSQL server is fully functional and supports JOINs, GROUPs, UNIONs, ANY, ALL, IN, subqueries and very limited transactions support.