najitool, libnaji, and naji_gui (najitool GUI) recommended compilers
Recommended compilers for najitool and libnaji:
GNU Compiler Collection http://gcc.gnu.org/
DJGPP, very simular to the above http://www.delorie.com/djgpp/
Recommended compilers for naji_gui aka najitool GUI versions 0.2.0.0 and bellow.
Microsoft Visual C++ 6.0
NOTE: This is not a free compiler, I've written naji_gui aka najitool GUI in a free commpiler now.
Recommended compiler for naji_gui aka najitool GUI version 0.3.0.0 and above for Windows, Linux, and MacOSX:
eC aka Ecere http://www.ecere.com/
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