Good but not excellent.
This program has a couple of design deficiencies. It appears to have one colormap hardcoded - thus working great for one depth. Try to increase the depth past 8 bits and it crashes and burns. I've also had it segfault even on 8 bits. I switched to fbi, it worked where this program did not. I got this program to actually spit out something useful at higher depths, but only after modifying the code, and it became painfully obvious that many more modifications were needed to make it work right.
This is a very nicely written utility for displaying images on a linux framebuffer. The code is easy to follow and does exactly what you expect it to.
Todo: add mmap().
An open, cross-platform journaling program.
A scientific plotting package.