(windows only)
CLICKY
it is quite straightforward to use and it traces the contours quite well. You still have to find a way to input it (such as ckfw posted somewhere in this forum). However, as with any font creating software, it's slow and takes a lot of time and patience. It also doesn't have a good preview.
Another downside might be that since it uses unicode's private use area, it's not possible to share with others. If anyone knows a way, please tell.