I use the FLAC and LAME command line tools, and I’ve tried many FLAC and LAME frontends. And I disliked all them. One day I decided to write my own, with a parallel multithreaded handling of the files, so all the files are converted at once, taking advantage of multicore CPUs.
Today I’ve just published it as open source on GitHub. It’s pure C and Win32. I hope it can be useful to someone – not only the program itself, but also my C programming techniques. It can be found at rodrigocfd/flac-lame-gui.