While I can happily recommend (and even recommend sponsoring! go do it!) raylib, I sadly cannot recommend this software (rTexPacker).
- the custom user interface is very small and inaccessible to use on mid-to-high dpi screens in windows. instead of 6 themes, I'd give the world for a "scale 200%" mode
- the contrast on many of the buttons and ui elements is extremely low, including enabled elements
- none of the fonts adheres to common legibility practices of modern UI
- the "dark" theme is overall the best for legibility, but the contrast on greyed out buttons is comically the lowest
- lots of interactions feel surprising or counterintuitive, and don't adhere to widespread UI standards
- many actions are not discernible from the labels on the buttons, e.g. "trim sprites alpha"
- there are no tooltips for most of the actual actions this tool performs
- by default, the sprite view is filtered with LINEAR/LINEAR_MIPMAP (in a sprite packer? this should default to NEAREST)
- zooming does not zoom to the mouse - it zooms... somewhere?
- rTexPacker can't seem to import existing sprite sheets (filmstrip or otherwise) that contain multiple frames
- individual UI elements "look" like windows in an MDI app, but the application does not work scaled to larger screens, all of the UI stays tiny and just moves apart impractically far. I expected every single one of them to be draggable, dockable, and resizable (in that order of priority)
It's not very expensive, but it was a mild disappointment - I'll not be switching to rTexPacker over TexturePacker.