"Lab Scheduler is a neat Google Sheets Add-on that enables you to easily create and maintain a lab or room reservation system for your school. Once you have added Lab Scheduler to your Google Spreadsheet it will walk you through the process of creating blocks of time and lab/room space in your spreadsheet. You can set your Lab Scheduler to maintain a preview of as many dates as you like. The preview is what people will see when they want to make a reservation. Share the spreadsheet with your staff and they can reserve a block of time in it.
I've been working on authentic assessments in my iObservation class, and I have come across the idea of "Performance Checklists" as an alternative to rubrics. This is a checklist creator.
Here's a science lab example already created: http://pals.sri.com/pals/tasks/5-8/Blue/rubric.html