Recs.
Updated
KiTTY is a fork from version 0.62 of PuTTY which has all the features from the original software, and adds many others.
Specs
Pros
Pro Includes additional features over PuTTy
Sessions filter
Shortcuts for pre-defined command
The session launcher
Automatic logon script
URL hyperlinks
Running a locally saved script on a remote session
Send to tray
Transparency
Quick start of a duplicate session
SSH Handler: Internet Explorer integration
pscp.exe and WinSCP integration
New command-line options
Cons
Con No centralized configuration
Each session holds its own configuration of all features. This means that if one wants to change a configuration common to all sessions (say, the terminal font), it has to be changed in each stored session separately.
A better solution would be to have a default configuration and store only the changed elements for each session (both configurations would be merged, with a priority on the specific one).