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If you're looking for a good free image compression utility, I could recommend Caesium : https://saerasoft.com/caesium/
I've been trying it out for a bit and it seems to do a nice job to reduce image file size while still usually keeping good visual quality, so could be good for getting your artwork images you might want to post on this site to a bit under the 1MB limit, or for resizing and compressing an profile Avatar image.
When using to compress images, I'd suggest to output to a different folder location, or to use a copy of the images you want to compress (otherwise the utility will overwrite the files selected to compress, but it should give a warning message about that).

Some other good free software that I use;

GIMP image editor: https://www.gimp.org

IrfanView image viewer: https://www.irfanview.com

Image Glass - another image viewer, I like to use this one when I want to keep an image on top of other things, so for example when using an image as a reference: https://imageglass.org

Media Player Classic - still a great video player: https://mediaplayerclassic.org

Handbrake - This tends to be my go-to video compression utility: https://handbrake.fr

Edit Pad Lite - A good alternative to Windows Notepad and in some ways a lot better with more features: https://www.editpadlite.com

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Well, that's a few things I tend to use often. If you have some good free software you'd like to recommend, feel welcome to share here.

CPUID / CPU-Z - A utility for showing a computer's detailed system information: https://www.cpuid.com/softwares/cpu-z.html

Duck Station - A great Play Station 1 (PS1) emulator (you'll need to source a PS1 BIOS file, but it's easy enough to find): https://www.duckstation.org

PCSX2 - Play Station 2 (PS2) emulator: https://pcsx2.net

VICE - A good emulator for old Commodore computers (Vic-20, C64, etc..): https://vice-emu.sourceforge.io

OBS - Open Broadcaster Software: https://obsproject.com

Easy Cat Timer: https://easycattimer.com

qBitTorrent - My go to Torrent software: https://www.qbittorrent.org