alternativeto.com - find open source software.
PublishedAlternativeto.com1 is a website which helps you to find software alternatives. Just type the name of the software you want to replace into the search bar and hit Enter. The results can be filtered by license (such as “open source”), platform (including “self-hosted”) and more.
The search result page displays some basic information about the software and its features as well as user reviews. Clicking on one of the alternatives takes you to its own page with more information and links to the official website/repository and the like.