thanks @winni!
I didn't know about adw modula2, do they release the entire source code of their tools? I'll explore the site you gave, when i have time!
The interest of XDS modula2 that I point, reside in the following facts :
1) all sources available
2) ANSI C transpiler
3) to the point of view of new Pascal students, modula2 can be see as a simplified Pascal, Oberon as a simplified Object Pascal
as you can get all the sources, you can improve the compiler by yourself. and it perhaps can give ideas to freepascal compiler's team, by studying such sources (especialy because all high lvl languages, today, drive a GARBAGE COLLECTOR at memory management... fpc is late on that point)
as it can compile modula and oberon thru C source code, you can use the produced C sources to build apps on many targets... CPUs and Platforms (already talk earlier about that)
Regards.