Event Log Analyzer Free
You could create a decent one with logon scripts. that would log the computer name, username, and logon/logoff time, into a csv file on a network share. And then use powershell to generate a nice pretty HTML report.
Event Viewer Analyzer Tool Free
Check this out for a logon/logoff script. It may need to be altered slightly for what I was thinking about. But could be easily doable. http://community.spiceworks.com/how_to/show/82-monitor-user-log-in-and-log-off-without-software instead of a log file you would use csv. and have to separate the time/date, username, and computer name with commas.
Children produce a small piece of reflective writing for their Portfolios. Children collaborate with their knowledge of bridges and symmetry to construct realistic bridges across the ravine in Minecraft. 
Teacher can reinforce Bridge vocabulary and Content Knowledge.
Event Viewer Analyzer Free
Most of the log analysis tools approach log data from a forensics point of view. But, Log and Event management uses log data more proactively. It can learn from past events and alert you on real-time before a problem causes more damage. Troubleshooting can be simpler by using the pre-defined filters organized by categories. The Event Log Consolidator is completely free and can be considered a light version of the more robust Manager. It can view logs across multiple Windows systems and even filter the logs by ID as well as patterns in the event data – not a huge amount of functionality, but for freeware, not just a free trial, it does an excellent job!