[statictype]

Not really related, but the popular python library for bcrypt kind of does make you have to think about salting. (And it has some other, er, 'curious' design decisions as well)

http://www.mindrot.org/projects/py-bcrypt/

[rpsw]

So does popular ones for .NET, Java, JavaScript.. I haven't seen one where the work factor is explicitly set in the homepage example yet, though.