I got into FOSS recently and have been researching replacements for common proprietary software. Along with reddit (r/privacytoolsio) I have used alternativeto.net & privacytools.io. I would love to make a list on Tildes for anyone that is also interested in this stuff.

Telegram -> Signal: signal.org
Discord -> Riot: riot.im (surprised this isn't as popular)
Google -> FindX: findx.com (there are many others but this is my favorite)
.................searX: searx.me
Reddit -> Tildes: tildes.net (obviously)
Chrome -> Firefox: mozilla.org (there are many others but this is my favorite)
LastPass -> Bitwarden: bitwarden.com (my personal favorite but there are others)
Photoshop -> GIMP: gimp.org
FireAlpaca -> Krita: krita.org
Microsoft Office -> LibreOffice: libreoffice.org
Windows Media Player -> VLC: videolan.org (Best FOSS ever)
uTorrent -> qBittorrent: qbittorrent.org
...................Deluge: deluge-torrent.org
Adobe Illustrator -> Inkscape: inkscape.org
Adobe Premiere Pro -> Blender: blender.org (mainly 3d stuff but can be used as animation)
Windows -> Linux: ubuntu.com (ubuntu is just one distro, there are so many)
Adobe Audition -> Audacity: audacityteam.org
..............................Ardour: ardour.org
Github -> Gitlab: gitlab.com
Trello -> Taiga: taiga.io
Fraps -> OBS: obsproject.com
Gmail -> ProtonMail: protonmail.com
Youtube Client -> NewPipe: newpipe.schabi.org
Outlook -> Thunderbird: thunderbird.net
Adblock+ -> uBlock Origin: (you can get it in your browser's addon store)
Unity -> Godot Engine: godotengine.org
USD -> Bitcoin: bitcoin.org (I would suggest an altcoin like Stellar though)
... anything else? any programs you don't know a FOSS alternative to that I can find?