We already have RedEyes Host monitor in the database and talked about the portable-friendly ShortcutsToTray but this developer has put out a BUNCH of great looking freeware:
https://www.mylanviewer.com/index.html
The following products appear to be trialware, even if Softpedia's entry for the very sharp Ping Manager seem to say freeware.
- MyLanViewer
- Remote Computer Manager
- Wake-On-LAN Proxy Server
- Ping Manager