I'm using Pencil right now to map out an upcoming project. It's one of the few useful GUI prototyping apps I've found that's free. Most of the competition is for-pay, and I just don't do enough of this stuff to justify paying for squares and arrows on a PNG (I use it for exporting UML and page flows ATM.)
If you don't want to build it, just use the original project's pre-built installation (RPM, Bundle, EXE here http://pencil.evolus.vn/Downloads.html). The difference between this reboot project and the original is likely minimal, so if you like the original, it's probably worth coming back and building the reboot project.
If you don't want to build it, just use the original project's pre-built installation (RPM, Bundle, EXE here http://pencil.evolus.vn/Downloads.html). The difference between this reboot project and the original is likely minimal, so if you like the original, it's probably worth coming back and building the reboot project.