I haven't found one I liked yet. Googles picture captcha, sometimes not humanly possible to solve them. Sometimes waste 5-10 minutes solving them, a few times I had to give up or change my IP. I have had Captcha Sniper for a few years, installed probably installed it 100 times, never got it work. 
FORCECLOSES AFTER IT GETS ABOVE 5000 URLS WAITING TO BE SCRAPED.  ITS INSTALLED ON A RECENTLY INSTALLED WINDOWS 8 OPERATIONG SYSTEM WITH 8GB RAM.  RUNNING AT 75 THREADS WITH AN I7 AMD PROCESSOR.
Don't know how you guys have or servers setup or even if its possible, butc I would greatly appreciate it if I wouldn't have to enter my licenses whenever I need to reinstall your app and my apps, I not one for good record keeping. ;)