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I found simplescreenrecorder (for Linux, probably for other OSs) fantastic for this.

I used GifGrabber but it's very bad. I'm sure there is a place for someone, especially for a web-based alternative.

(I also have LiteCap, QuickCast, ... but there are all really bad)

Not sure if it's what grandparent used, but I recently discovered QuickTime Player has a feature to do screen recording that works pretty well

If you have a Nvidia graphics card 6xx and higher, a feature called "Shadow Play" does a great job of recording on screen content.

Open Broadcaster Software? https://obsproject.com/

Hmm, can OBS capture WebM to be uploaded to Gfycat?

Actually, it'd be nice to have a program that records WebM + uploads to Gfycat in one step.

QuickCast is great for recording and hosting tiny screencasts too

ffmpeg -f x11grab -s 1024x768 -r 30 -i :0.0 -sameq x11grab.mpg