Free Software

I am a programmer, and I would like to get some thoughts / advise from you all. I have written several programs for my own use such as a program to graph dynamical systems, a cryptography program, a neural network program, a pi calculator, and several other simple programs. I would like to put these out there freely available, and maybe even get collaboration on improving or developing some of them. I thought this would be a great place to do that. But, the forums offer discussion and a gallery, but not an ftp or anywhere to allow downloads. I may just buy a cheap ftp site. Any suggestions?
Chris