The SuperPuTTY Window Manager for putty sessions https://www.facebook.com/superputty
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Pros
Pro You can run tabbed sessions
Dynamic placement of tabs side-by-side vertically or horizontally (similar to IDEs like Eclipse/Visual Studio). This is an upgrade of the original PuTTY, which lacks this feature.
Pro PuTTY configuration reachable and adjustable
Since it uses PuTTY underneath you can create and configure profiles/sessions there which you can reuse in SuperPuTTY and apply to connection in any fashion you like.
Pro Easy shortcut-driven navigation
By setting up certain shortcuts you can quickly bring up your sessions, select one by typing out the first letters, return-selecting it and cycle through your tabs.
Pro Customizable UI to allow for maximum net screen size up to fullscreen
Pro Open source
Open source and hosted on Github.
Cons
Con You still need to install PuTTY first
SuperPuTTY is a wrapper available for PuTTY, not a standalone program, therefore you need to have a PuTTY installation before you can use SuperPuTTY.