"i am using sdcc for 89c51,2051,philips-rc2, rc+, rd2, rd+...."

And what is your opinion of SDCC?

Is it any good?
Have you found any pros and/or cons?
Would you recommen it?

Have you experience of other 8051 compilers to provide a comparison?

"it gives me a better satisfaction with a free downloaded editor..."

I had assumed that it was purely a compiler, so the user would have to supply their own editor.
Are there any other tools included with the "package" - Librarian? Linker? Locator? Assembler?...
I presume you also have to provide your own 'make' system?