What are the following software's purpose and what can they do? I'm having trouble trying to figure them out.

1. Hamachi

2. Cabos

3. PuTTY

4. TightVNC

A couple of your links already give explanations of what the software is, such as Cabos and TightVCN.

Keep on with Google, you are on the right track

This is free Virtual Private Network (VPN)-ing software. I've used it before and it's pretty damn good. One can use it to send messages over the network and be part of the community (in addition to the normal VPN features).

The rest of the software you have listed I am unaware of and will research into them later; whether I choose to explain them to you or not is ...undecided, yet--I've already contradicted, slightly, what hazelnut has said.

I now know what's this software's for. It is a File Sharing Program that are based on Limewire and Acquisition but it's safer because it has NO spyware and NO adware.