clamwin portable
Free (Open Source)   
2

This is an antivirus system portable with updates automatically

moon secure antivirus
Free (Open Source)   
3

We present an open source antivirus that requires few system resources in order to be working perfectly.

clamwin

ClamWin

 0.98.1
Free (Open Source)   
2

ClamWiun is a fantastic free antivirus that protects your computer completely.

360 total security

360 Total Security

 10.2.0.1310
Free   
7

360 Total Security offers the protection of 5 antivirus engines with the most powerful tools to optimize your PC.