Helpful Secondary Programs

-Inkscape = good for anything 2D and some 2.5D, exports for laser, mill, lathe, plasma, etc
-FreeCAD = very good for design and modeling, tech drawings, assembling stuff, and even some machining
-LibreCAD = poor mans AutoCAD, 2D DXF and such
-GIMP = photo editing at it's best, like PhotoShop but without the convolution
-KDenLive = non linear video editing, like Adobe Premiere but without the crashes
-Transmission = torrent downloader for ISO files
-FileZilla = SFTP with a nice GUI, upload/download from SSH servers
-Blender = absolute monstrosity, 3D modeling/editing/crayons/rendering/animation on steroids, BlenderCAM does 3D machining
-OBS-Studio = recording and streaming anything and everything, desktop, cameras, video files, etc
-HTOP = for whet stuff goes sideways, CLI only, good for finding what is bogging down the PC.
-TestDisk = CLI only, for when HDD/USB/NVME drives go bye bye, recovery
-NMap = network scanner, DO NOT USE without properly reading documentation = nuclear for someone with a 10GB line and no knowledge. This is all you ever needscan only port 22 and only on the 192.168.1.x subnet, these IP addresses are private so are not routed outside of local network.
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That is always on my personal PC/laptops, i have a lot of those around.
Also worth mentioning are
Dmap2Gcode = exactly what name implies, takes a pictures and generates a depth map for machining = i use it often
PyCAM = can do pretty good 3D machining, was quite slow back when i tested it so probably now it is better
ScorchWorks (makers of dmap2gcode) have some other machining stuff, very simple and useful.

Ventoy = for making bootable USB drives, very easy to use and has CLI and GUI, copy all the ISO to the USB, plug it in and choose what you want to boot.
Works with almost all ISO, Debian, Mint, etc, all work. Very good for testing, recovery, having a look at a distro without installing it, etc, etc. Boots FreeDos, for anyone into retro PC's.
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Sorry, did not feel like editing the above post and risking making a mess. That warning must be seen.

This will install everything on the main list, the bottom 3 are just download and run.