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@stux@mstdn.social#Mastodon is kinda the open source alternative for #Twitter but there's more!
For almost all 'mainstream' (social) platform there are FOSS (free open source software) alternatives you can host yourself!
Here are some you should checkout:
Pixelfed (Insta alt): https://pixelfed.org
PeerTube (YT alt): https://joinpeertube.org
Matrix (Chat): https://matrix.org/docs/projects/server/synapse
Pleroma: https://pleroma.social
Misskey: https://join.misskey.page/en-US
WriteFreely : https://writefreely.org
PixelfedPixelfed - Decentralized social mediaLearn more about Pixelfed, the free and open-source decentralized photo sharing social media platform