PuTTY is a popular SSH client for windows which everyone uses. While PuTTY is a great free app it is just basic, if you want to open multiple SSH connections in a tabbed interface then look at Putty Connection manager.
PuTTY connection manager is also a freeware and comes as a standalone and installable file. It needs Microsoft .NetFramework 2.0 to function. With this app you can have a tabbed interface for PuTTY. Open multiple SSH connections easily. The software doesn’t come with PuTTY you need to download PuTTY, you can download puTTY from here. First time it will ask you to enter the location of the PuTTY.exe file.