Mi favorito que uso todos los días y no entiendo que no lo use todo el mundo es : thunderbird

My favorite that I use every day and I don't understand why not everyone uses it is: thunderbird

ShareX and it isn't even close

NetHack!

Uptime Kuma is a fantastic selfhosted status page system. You can use it to track and notify you of network outages or it can scrape a url for a key word and alert you when it's found. I've heard people using the keyword feature to find out when RPI go back in stock for example.

I use it at work to keep track of our systems and their uptime as well as cloud systems we use.

Linux, Firefox, Apache

Right now, it's Warpinator. Makes at-home wireless file transfers so damn SIMPLE.

Media Player Classic (I'm unsure if the latest iterations are or even if the Home Cinema edition is open source), TOR, qbittorrent, firefox, thinderbird, obs to name a few that I use regularly.

Qemu/kvm

ReVanced. I love my ad-free, sponsor-blocking, Shorts-removing YouTube experience.

As a bonus, I also enjoy using Mp3tag. It's a program I can use to easily change and update the tags on all my music files, and it can even do it all in batches. It can also connect to various music services (Discogs, Musicbrainz, etc.) to get music tag info directly so you don't have to type it all in manually.

Neovim(astronvim ftw), Firefox,

Linux,KDE,Bitcoin,F-droid and everything built around them.