GUI

If you're comfortable working in C, Agar is very easy to pick up, much easier than GTK and Qt IMO. It's a complicated codebase, but if you need to add a feature or otherwise hack on the library itself, it's put together in a pretty consistent and sensible way. The maintainer is very friendly and...

Build Air Traffic Controllers A-CDM application

Clean your data, validate and correct, remove duplicates, and build cross-references between source and target tables in a visual way.

Worked smoothly for completely wiping my data from SSD's.

Large, well established framework with huge community