What Is The Available Software For Unix?
How long is a piece of string?
You need to be a lot more specific in your question if you hope to get an answer.
Do you mean applications or the variants Unix OS? If applications, to do what?
This question is too vague. What kind of software are you looking for? You can find a Unix application to do everything you could ever want.
For Linux, check out
If you want something specific - you'll need to give us more information, and also which flavour of Unix you are using.
Cheers
ZB