Is Turbo C++ good for learning ? I heard from many.
Also I heard about bloodshed's Dev C++ the same thing.
Why are the C++ softwares different?

So long as you stick with ANSI C++ ... and don't use the extensions provided by compiler developers, than your code should work no matter what compiler you use.

There are multiple compilers because different companies developed different compilers to make money ;) There are also different compilers, because you can compile ANSI C++ on Linux, Windows, Solaris, whatever. Different compilers work on different platforms.

Billy3

If you are talking about Turbo C++ version 3.0 (or lower versions), then its outdated and should be avoided. It was released in 1991 by Borland and C++ has undergone many standard changes since then. Turbo C++ runs in DOS mode and opens up in blue screen.

If you are talking about Turbo C++ Explorer, then it appears to follow current C++ standards and can be used. They are free to use. Although I never tried them.
http://www.turboexplorer.com/

As far as Bloodshed DevC++ is concerned, it has not been updated for few years. So the GCC pack it contains is outdated.

I personally use CodeBlocks IDE which comes packed with GCC. Its free to use and follows latest standards.
http://www.codeblocks.org/