Free Software for Self-Hosted
PhotoPrism
PhotoPrism is a free and open-source server-based application for browsing, organizing and sharing your personal photo collection. PhotoPrism makes use of the latest technologies to automatically tag and find pictures without getting in your way. With PhotoPrism, you can say goodbye to solutions that force you to upload your visual memories to the cloud with big tech cloud providers.
Node.js
Node.js is a free and open-source JavaScript runtime environment built on the V8 engine. Node.js can execute JavaScript outside of a web browse and works cross-platform. The platform is used to power many JavaScript software project and web application in production today. Node.js is perfect for data-intensive real-time applications due to its event-driven and non-block I/O model.
RedisGraph
RedisGraph is the first free and open source queryable Property Graph database to use sparse matrices to represent the adjacency matrix in graphs and linear algebra to query the graph.
Apache Hadoop
Apache Hadoop is a free and open source software library that allows for the distributed processing of large data sets across clusters of computers using simple programming models. Apache Hadoop is designed to scale well, from single servers to thousands of machines offering local computation and storage. With Apache Hadoop you can store any kind of data and utilize the enormous processing power with the ability to handle virtually limitless concurrent tasks or jobs.
Jetpack
Jetpack is the WordPress toolkit developed by Automatic, the developers of WordPress. The plugin provides security, performance, marketing and design tools for WordPress powered websites. Jetpack allows over 5 million WordPress users to monitor site changes, debug, troubleshoot and maintain a healthy and secure website.
Underscore.js
Underscore.js is a free and open-source JavaScript library that provides over 100 functional programming helpers without extending any built-in objects. Underscore.js can be used for function binding, javascript templating, creating quick indexes, deep equality testing, and much more.
Webiny
Webiny is a free and open-source static site generator and headless CMS written in JavaScript.
JerryScript
JerryScript is a lightweight JavaScript engine for resource-constrained devices such as microcontrollers. It can run on devices with less than 64 KB of RAM and less than 200 KB of flash memory.
PgHero
PgHero is a free and open-source performance dashboard for the database PostgreSQL. With PgHero you can monitor query performance and overall health of your Postgres database. The project is openly developed and battle-tested by the grocerie delivery platform Instacart and release under the MIT License.
Envira Gallery
Envira Gallery is a WordPress plugin that can be used to create a gallery for your Wordpress-powered website. With Envira Gallery you can showcase images to your visitors with ease. Envira Gallery is also avalible for the WordPress.com platform if you are signed up on a business plan.