I wrote a GUI for another seam carving library back in 2009[1], and it looks like although in archive mode, you can still access the source as well as the windows / mac binaries. Just tested it and it still works!
Not as fancy as photoshop I'm sure, but does have the ability to paint a mask of regions to keep / remove to aid the algorithm and get the desired result. Multi-threaded too!
Now that this thread is essentially tially dead, I can let out my little secret - I'm not the bad boy you think I am. I told them thw truth eventually -about 30 seconds after showing them the doctored one. I hope this doesn't change your opinion of me.
Not as fancy as photoshop I'm sure, but does have the ability to paint a mask of regions to keep / remove to aid the algorithm and get the desired result. Multi-threaded too!
[1] https://code.google.com/archive/p/seam-carving-gui/