SXM, or the SmallBasic Extension Manager, is a program intended for use beside the
Microsoft Small Basic programming language, which is a small programming language intended to help beginners get into programming.
SXM makes the task of downloading and managing extensions to the language easier and safer by maintaining a "pool" of verified extensions that can be downloaded via the client, which will automatically monitor for updates.
SXM is built for version 3.5 of the .NET Framework, so any users with Small Basic installed and running should have no problems running SXM.
You can find the web page for SXM here.