What are softwares for Botnet or making DDoS attack? Below are some quotations from the internet. Thhis information is not intended to attack some computers, its for study purpose.

Current versions of Zeus and SpyEye botnet software are for sale, or you can find the last version cracked by someone for cheap or free.
"Ddos Attacking Web v1.0"
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"Ddos Attack Tool Dos"

4) Dos tools list: http://resources.infosecinstitute.com/dos-attacks-free-dos-attacking-tools/

What can be needed?
1. Software
2. VPN proxy to connect botnet hosting
3. Bulletproof hosting (underground forums)
4. A bulletproof domain name/s to communicate botnet
5. add bot into first PCs?