The RSA in large refers to either the three giants or the company from the three giants. Of course there are also may algorithms for cryptography from RSA, like those hash/digest MD# series, symmetric ciphers RC#, and the number theory based public key RSA ...

PGP from pgp.com/ might be a good example for idot-proof program, especially the PGPfreeware which is totally free of charge.

If what you mean by RSA is the cryptography, you may find more like DSA, ECC, etc, than the almost historical RSA ...