Affiliate link plugin

Hello All,

I was going through one website and noticed that all outbound link are masked.

Link shown to user: http://www.example.com/url.php?go=http://www.snapdeal.com/products/mens-footwear?q=Occasion_s:DOD

Actually link : http://track.in.omgpm.com/?AID=420791&MID=159526&PID=8053&CID=3869625&WID=44030&redirect=http%3A%2F%2Fwww.snapdeal.com%2Fproducts%2Fmens-footwear%3Fq%3DOccasion_s%3ADOD%26utm_source%3Domegatxn%26utm_campaign%3Dafts

Its an affiliate link. But for user and for search engine its a normal outbound link.

May i know which plugin or which tool we can use to get similar type link.

Actual affiliate linking procedure is
Affiliate Tracking code + External Site Link + UTM code

What i see is only Site Link + url.php?go= + External Site link

Thanks in advance