[kebman]

Great tips! Thank you! I'm more into 2D compositing for video, but I've had my eye on Blender for some time. Not sure how it stacks up against stuff like After Effects. For audio production I already use Reaper FM, but I might give Bitwig a go too. ^^

[blcArmadillo]

Not open source; however, supposedly DaVinci Resolve is supported for Linux: https://www.blackmagicdesign.com/products/davinciresolve/. For most people the free variant should be more than enough.