[pirateking]

I have heard of musl[1] and Bionic[2]. Interested in hearing about any others.

[1] http://www.musl-libc.org/

[2] http://en.wikipedia.org/wiki/Bionic_(software)

[aptwebapps]

Those seem to both use basically the same algo as the glibc one, all though a little more compactly written.

[justincormack]

Uclibc and dietlibc. Must recommend Musl for code readability and implementation quality.