[yodon]

Simple easy UI and enough capabilities to accomplish the occasional manual image editing tasks I need as a dev, in a free and open source tool.

[haunter]

>in a free and open source tool

It’s not open source for more than 15 years. The last FOSS version was released in 2009 November

[marwis]

It's not open source and hasn't been in a very long time.

Still very useful though.