Basically, what the title says. Do you use any app, that is proprietary, but either has no OSS alternatives or they’re all not good enough? If there is an alternative, what keeps you from switching?
Image tool box doesn’t seem to be able to arbitrarily rotate or add text. Some nice features, though.
Open Video Editor doesn’t seem to be able to combine videos. I’m thinking something like CapCut, which allows combining photos, videos, and audio. It would be an ambitious project to be sure, but it seems like it should be doable.
Promising! HEIC/HEIF formats are still a challenge for this tool.