eLabFTW is an electronic solution to the classic lab notebook and offers many additional practical features (schedular, collaborative working, lab equipment management, etc.). It is an open source solution that is already in use at many research institutions worldwide.
TU Graz runs its own instance of eLabFTW and it is available to all members of TU Graz.
Since you interact with the software primarily via the browser, you do not need any additional software.
You can access the portal via this link and you will find useful information under the support section.
There is also an online live demo offered to get an overview of the functions.