Here is a free invisible hack made by Arnohh AKA Sneldood.

I couldn't upload an image.

Here is virus scan:
AhnLab-V3 2008.9.2.0 2008.09.02 -
AntiVir 7.8.1.23 2008.09.01 -
Authentium 5.1.0.4 2008.09.02 -
Avast 4.8.1195.0 2008.09.01 -
AVG 8.0.0.161 2008.09.01 -
BitDefender 7.2 2008.09.02 -
CAT-QuickHeal 9.50 2008.08.29 -
ClamAV 0.93.1 2008.09.02 -
DrWeb 4.44.0.09170 2008.09.01 -
eSafe 7.0.17.0 2008.09.01 -
eTrust-Vet 31.6.6062 2008.09.01 -
Ewido 4.0 2008.09.01 -
F-Prot 4.4.4.56 2008.09.02 -
F-Secure 7.60.13501.0 2008.09.02 -
Fortinet 3.14.0.0 2008.09.02 -
GData 19 2008.09.02 -
Ikarus T3.1.1.34.0 2008.09.02 -
K7AntiVirus 7.10.435 2008.09.01 -
Kaspersky 7.0.0.125 2008.09.02 -
McAfee 5374 2008.09.01 -
Microsoft 1.3807 2008.09.02 -
NOD32v2 3406 2008.09.02 -
Norman 5.80.02 2008.09.01 -
Panda 9.0.0.4 2008.09.02 -
PCTools 4.4.2.0 2008.09.01 -
Prevx1 V2 2008.09.02 -
Rising 20.60.10.00 2008.09.02 -
Sophos 4.33.0 2008.09.02 -
Sunbelt 3.1.1592.1 2008.08.30 -
Symantec 10 2008.09.02 -
TheHacker 6.3.0.8.069 2008.09.01 -
TrendMicro 8.700.0.1004 2008.09.02 -
VBA32 3.12.8.4 2008.09.01 -
ViRobot 2008.9.1.1359 2008.09.01 -
VirusBuster 4.5.11.0 2008.09.01 -
Webwasher-Gateway 6.6.2 2008.09.01 -


It makes you Invisible in-game obviously...