If you cannot use the eval versions of the Keil or Raisonance then you should search on this web site. There are some low cost alternatives and there is one free C compiler out there.

However...asking someone to send you a free copy of a comercial compiler the is normally sold for money is ILLEGAL. It is illegal for some one to send it to you and it is illegal for you to accept it.

Since you are a student you should check with the engineering or computer science department folks at your educational institution. Very often, if they offer 8051 courses, they have made special arrangements with a 8051 tool vendor to permit students to get access to a particular compiler off the school network.

Michael Karas