Open Source Software for Self-Hosted
n8n
n8n is a free and open node-based Workflow Automation Tool. n8n can be self-hosted, while also being provided as a managed sulotion at n8n.io. The software can easily be extended and integrated with popular third-party services such as Github, Slack and many more.
Ionic Framework
Ionic is an open-source mobile app development framework that makes it easy to build high quality native and progressive web applications. The Ionic Framework takes advantage of power and flexibility of Angular to enable developers to build production-ready applications in a way that feels familiar. The Ionic Framework is released free and open-source under the MIT License, but the company behind the framework also provides the Ionic Enterprice Platform which enables large organization to launch enterprice-grade applications faster to the cloud.
Calendso
Calendso is a free and open source self-hosted Calendly alternative. Calendso is white-label by design and can be hosted on-premise or can be hosted and managed by Calendso for a monthly charge. The calendar software is built to be API-driven and ready to be deployed on your own domain and does not add hurdles to the self-hosting process to favor the managed solution. Calendso provides modern features and comes with integrations for popular third-party services like Salesforce, Zapier, HubSpot and many more. While also allow you and your company to build custom integrations for any platform out there, and integrate seamlessly with your existing workflow.
Django Rest Framework
Django REST Framework is a free and open-source, powerful and flexible toolkit for building Web APIs with the Python framework, Django. With Django REST Framework it easy to create full-fledged REST APIs that follows the Django design pattern with models, views and urls. It comes with authentication policies including packages for OAuth1a and OAuth2 and a pre-built browsable API, much like Swagger.
AmCharts
AmCharts is an interactive JavaScript library use to create chart and maps for data visualization. With AmCharts you can create interactive charts that allow your users to scroll, hover drag and select data for better visualization and manupulation.
Dark Star
Dark Star is a web framework that provides filesystem routing for Starlette and first-class support for server-side rendering. The web framework's routes are defined by their filesystem path and both the route's backend code and template are contained in the first page. Dark Star aims to provide an easy way to create web applications using the HATEOAS and HDA philosophies favoured by htmx. It also aims to reduce the boilerplate code normally needed when creating web apps. In particular, it looks to reduce the need of having a separate files for view functions and templates. It tries to embrace Locality of Behaviour by putting the view function code and template in the same file, and having the file's path be the route used by Starlette to access the code.
Sinatra
Sinatra is a free and open source DSL library for quickly creating web applications in Ruby with minimal effort. Sinatra is loved by many due to its simplicity and ease-of-user. For Ruby developers, Sinatra is an alternative to web application frameworks like Ruby on Rails, Merb, Nitro, and Camping.
Elasticsearch
Elasticsearch is an open-source, highly scalable search and analytics engine written in Java. The engine is built ontop of Apache Lucene Library and has an advanced distributed model and consistent API interface. Elasticsearch allows you to store, search, and analyze huge volumes of data quickly and in near real-time with answers provided in milliseconds. Making it perfect for building full text search, analytics store, auto completer, spell checker, and alerting engines.
Vue.js
Vue.js is a free and open-source intuitive and composable MVVM framework for building interactive UIs with JavaScript. The library was first created and released by Evan You back in 2014, and saw a meteoric rise in the open-souce community. Possibly due to the accessible nature of the project and the library itself. With Vue.js you can get started by simply importing the script via CDN, and start building. Today, Vue.js is used in a multitude of web applications and powers interactive interfaces for people to enjoy across the globe.