The SuperPuTTY Window Manager for putty sessions https://www.facebook.com/superputty
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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 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 Split-Screen 1-to-Many Tabs Horizontally/Vertically
Dynamic placement of tabs side-by-side vertically or horizontally (similar to IDEs like Eclipse/Visual Studio).
Allows for multiple tabs.
Pro Open source
Open source and hosted on Github.