[admantis]

The server and client are written in C++, the server browser is written in Delphi and it uses RakNet for networking. The majority of SA:MP is based on reverse engineering. Another considerable portion of the code is Assembly (ASM) because San Andreas is closed source and SA:MP needs to access low-level information in order to work. Nothing else is really known, you must be a very experienced coder to make SA:MP.