Web Directory

» AuthentiX
   Authentication with AuthentiX and ODBC allows you to protect individual directories on IIS by asking browsers for their user's name and password. Your NT user/password database remains separate and private. By Flicks Software.
   http://www.flicks.com/flicks/authx.htm

» Session Server for Windows
   Has built-in fail-over protection and load balancing. A session "sticks" to a session server not by IP as in the case of a local director, but based on session ID so that the browser is guaranteed to maintain its session. [Commercial]
   http://session-server.db3nf.com/session-server/session-server.asp