I using MembersGear.com for my next product launch. It wont work for you if you only interested in ClickBank. MembersGear integrates directly with PayGear and updates your affiliate listing automatically. One time offers or very easy to set up in MembersGear as well. You can do rotating login pages and they have video set up tutorials as well.

Best of all its free to use. I downloaded it just to check it out and it turns out I liked it a lot so I went with it.