WCA Score Taking tools
The WCA highly recommends the use of WCA Live before and during a competition. WCA Live is a platform for running WCA competitions and sharing live results with the world.
Score sheets and scrambles should be processed and checked for errors before sending them to the WCA Results Team. You can use Scrambles Matcher, an Open Source project created by Philippe Virouleau.
The latest version of the WCA competition Score sheet can be downloaded here:
WCA competition Score sheet.
You may also want to use Groupifier for preparing competitor groups for a competition. It's a tool that aims to do exactly this for you. Among the main features you will find: sorting competitors by rankings, assigning tasks (judging, scrambling), deciding how many scrambles are needed, generating score sheets, personal sheets, and summaries. It's an Open Source project created by Jonatan Kłosko.