Linking directly to reddit helps them show up at the top of search results. Use archive websites.
The person who created the “List of Active Reddit Alternatives” is a dev who helped work on saidit.net. They deleted the post themselves and quit being a mod of that redditalternatives sub; due to their disgust with reddit and many of the users on it.
That subreddit is not trustworthy now. I recall someone sharing evidence of content they’re censoring.
Open Source Alternatives to Popular Software https://openalternative.co/
Self-hosted software https://selfh.st/apps/
A list of free, self-hosted software https://awesome-selfhosted.net/ - https://github.com/awesome-selfhosted/awesome-selfhosted
Open source (OSS) Blacklist: A blacklist for keeping track of OSS hostile companies/organizations https://sh.itjust.works/post/13060070 - https://codeberg.org/QazCetelic/OSS-Blacklist