Skype Labview SDK (free)
Now you can call, and send messages with skype
Free to download, and use
Memory monitor vi (free)
Monitor the free memory available
Dircetory monitor vi (free)
Monitor any event occurred in directory like file dreat,delete, or rename.
Cryptographic Library, including secure encoding and decoding of data, as well as many other operations, such as hashing, random number generation, and message authentication.