Hey, if you're looking for something that takes over the printscreen key, there is an awesome open source app called Katana. If you're looking for a Windows app, i would suggest Screenpresso. ( Yes I know, it isn't open source :) )
I can recommend Greenshot too - open source Windows screen grabber, though that doesn’t really do it justice. Integrated upload to imgur and other places, all that stuff.
They already have a mac version aswell! :)
Ah - somehow I'd missed that when downloading the PC version at work. Thanks, I'll go grab it now. :)
I'm pretty happy with LightShot at the moment, but I'll definitely check those out!
For Windows, I'd highly recommend ShareX. It's open source!
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