Free Software for Self-Hosted
Virtualmin
Virtualmin is a powerful and flexible web hosting control panel for Linux and BSD systems. Virtualmin provides a cost-effective and comprehensive solution to virtual web hosting management. Virtualmin is avalible as a commnuity-supported version, while a commercial option includes premium support and more features. Currently, over 100,000 people and organizations use Virtualmin globally.
QuestDB
QuestDB is a relational column-oriented time series database designed for real-time analytics on time series and event data. It uses the SQL language and include extensions for time series data. QuestDB is released as free and open source software and distributed as a single binary including a trimmed version of the JVM (Java Virtual Machine) weighing in at only 24.5 MB.
Froxlor
Froxlor is a lightweight, free and open source server management panel. With Froxlor, you can meet all your server management needs with an administration panel that simplifies the effort of managing your hosting platform. Froxlor is developed by experienced server administrators and released as a free software under the GNU General Public License.
Contact Form Builder for WordPress
Contact Form Builder is a popular plugin used to create forms for WordPress-powered sites. With Contact Form Builder for WordPress it's simple to create feature rich forms that can capture contact information and other useful form data.
IHP
IHP is a batteries-included web framework optimized for long-term productivity and programmer happiness. IHP is written in Haskell and allow you to build web applications using functional programming with an incredible type system. IHP provides a unique take on web applications building and provides a GUI which makes creating database tables, running migrations and generating MVC scaffolding even easier.
Vapor
Vapor is a web framework for Swift. It provides a beautifully expressive and easy to use foundation for your next website, API, or cloud project. Vapor's documentation covers everything from creating your first application to building large projects. With Vapor you can wirte and run swift on the server with a non-blocking, event-driven architecture built on top of Apple's SwiftNIO.
Seafile
Seafile is an open source file sync & share solution designed for high reliability, performance and productivity. Sync, share and collaborate across devices and teams. Seafile can be self-hosted, or provided as a managed and hosted solution. With Seafile, you can rest assured that your files are safe as all files are encrypted before syncing with the server, even system administrators have the capability to view your personal files.
MonetDB
MonetDB is an column-oriented database management system developed at the Centrum Wiskunde & Informatica. The database is released as free and open source software under the Mozilla Public License 2.0. By design, MonetDB can handle high performance on complex queries against large databases with hundreds of columns and millions of rows.
TaffyDB
TaffyDB is a free and open source, Pure-JavaScript database abstraction that stores data in JSON format. TaffyDB provides INSERT, DELETE, GET (SELECT) and JOIN methods to execure the data similar to that of traditional relational SQL databases. TaffyDB allows you to quickly setup an in-memory database that can be used in the same fashion as an SQLite database would, without configuration and a database server running.