Open Source Software for small libraries?

I have my personal library listed here on LT, however it is a LIBRARY and I loan books out and keep a record of who borrowed them.

I would like to find a open source (and free) program to check books in and out.

I would prefer it to be written in C or C++ but any code at all would be nice to start with.

I would like links to actual programs, places to search for programs or other things that might be helpful.

I am starting a new group for this here (post there please):

http://www.librarything.com/groups/opensourcepersonalli

Thank You,

Caleb

Not exactly open source, but it's free:

http://www.getlibra.com/

It supports the import of LibraryThing library, so you can get started right away without the need to rebuild your collection.

Casey

May be more than you need, but: http://www.koha.org