I created a few plugins for the OCS inventory server software. If you want to use them follow the instructions in the Readme, found in each repository or on the OCS inventory wiki.
Currently all of these are for windows only and realised via a vbs script. Click on the header to get to the repository on Github. And, of course, all of them are open-source and free to use. Also feel free to send me a pull request.
Retrieves the latest logins on a windows machine from eventlog via a vbs script.
Get disk volume infos from a windows machine like drive letter, size, serial and more.
Get the last update date from a windows machine.