Major Sources

Free, open source alternatives to some popular programs

Clone Wars- List of 100+ open-source clones of popular sites like Airbnb, Spotify, Tiktok, Netflix, etc. 

LinuxCafe - Delightful Privacy

This is a collection of software, operating systems, and other miscellaneous tools to help the average user fight for their privacy and security online.

samedamci - FOSS_Stuff

A more in-depth list of free and open source software ranging from Android, to Windows, to Linux with a bonus of some tips and tricks!

Mirrors in: GitHub ,GitLab, and Gitea.

BTW.so  ("We’ve curated 200+ open source alternatives to tools that businesses require in day-to-day operations"

De-google-ify Internet is an initiative started by Framasoft that provides a list of privacy-friendly apps and internet services. Despite what the name might suggest, the list offers more than just alternatives to Google software. For example: Evernote, Trello, and Flickr to name a few.

Compute Freely is a website designed to be approachable and friendly for people curious about free and open source operating systems and Linux distributions. Each Linux distribution listed comes with a rating to help indicate it’s difficulty to get set-up, along with a brief description.

YunoHost

YunoHost is a libre operating system, that eases installing web applications on your own hardware. It also provides you with your own email server out of the box.

YunoHost features a large (and growing) catalog of apps and an easy-to-use interface.


FreedomBox

FreedomBox is a libre self-hosting system and also a commercial product. It has less apps than YunoHost but can be bought as a ready-to-use product.


Disroot

Disroot is based in Amsterdam in the Netherlands, and is run by volunteers. Its services include email, cloud storage, a Diaspora pod and much more. The site is available in English, Spanish and French.

https://prism-break.org/en/

https://opensource.builders/

https://brianlovin.com/security

https://ssd.eff.org/en