Yes, there is a free HUD which displays VPIP, PFR and also AF (Aggression Factor). It's called 'Jivaro'. It's a free HUD which can only be used on PokerStars and on a Windows PC. They have also released a 'Premium' version which includes premium opponent statistics, positional awareness of statistics, a tournament command centre and street specific statistics. The 'Basic' version of 'Jivaro' will always be free but the 'Premium' version has a monthly subscription of $4.99. What's good is that they're allowing you to trial out the 'Premium' version until the 4th August 2015. Hope this helps.