Not sure if this is the right forum - I've put together a somewhat customizable scoring program using Google Sheets and I'd be interested in anyone's thoughts. 

I know there are many existing systems out there for scoring regattas, but this one is mine. It uses two linked workbooks: one for the race organizer (to set options, enter registration info, and record scores) and another one for the public (to display scores and standings).  Scores can be entered from a phone or tablet on the race committee boat and viewed in real time on the public page.  I've used versions of this for some of our local Vanguard 15 regattas.

The race organizer "RC Access" workbook includes instructions for use on the first tab.

Here are templates that can be copied and set up for a particular event:
Copyable RC Access Workbook
Copyable Display Workbook

For anyone who wants to play with it but doesn't want to go through the trouble of copying and configuring it, here are versions that are partially editable (they might get messy if multiple people edit at once):
Editable RC Access Workbook
Display Workbook for Editable Demo

This is a little more cumbersome and less fully featured than some of existing regatta management options, but I enjoyed the challenge of building it and figured it might be useful if anyone out there wants a free, transparent, and customizable scoring program.  If you want to use it for anything, please just give me credit, and don't rely on it without checking your work.