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Photoflare – Simple but powerful Cross Platform Image Editor
(photoflare.io)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
Yes, I did try to install it on Windows.
Still, that really disqualifies it from being open source...
Like "free" software requiring installation of weird browser toolbars back in the day. I still have nightmares about those things.