SL Friends Monitor
The 1.8 version of SL Friends Monitor is available as a free download on our website. The program lies within Office Tools, more precisely Timekeeping. The most popular versions of the tool are 1.8, 1.7 and 1.6. This free tool was originally designed by ProfileSLive. The most frequent installation filenames for the software are: SL Friends Monitor.exe and SL Monitor.exe etc.
From the developer:
SL Friends Monitor is a VERY small program that runs quietly in your systray (right next to your clock). You can right click on the icon at any time to change it's settings. You need to use your Second Life username and password to log into our SL Friends Monitor program. Once logged in, our program will automatically monitor which of your friends are online (no need to be in Second Life yourself).
You may want to check out more software, such as Phone Monitor, LAN Audio Monitor Sending End or CoffeeScript Monitor, which might be similar to SL Friends Monitor.