what is the difference between free available and free soft? Also what means cost recovery software?

Answer 1

Some software is free to download and ends up being a trial version - you can use it for awhile which could be even quite awhile. Some software is free forever and ever. Some of either of those two types is supported by advertising that appears in the window when you use the software. Some is not. So you have four types of software: Trial type with ads, Trial type without ads, Truly free with ads, Truly free without ads.

In addition, some of the truly free software has a built-in button you can click to "donate to the cause..." You might consider this to be advertising, or maybe not.