OASIS is the Overwatch AI Skill Improvement Simulator. It is a deep-learning tool that can also provide suggestions to improve your gameplay. It is suggested you read the documentation and reddit thread for the project. Some of the suggestions can be strange or misleading unless you know what you're doing.

Simple Google Docs Overwatch SR Tracker

This is a simple Google Docs spreadsheet for tracking SR. I made my own because I'm a picky little thing. This sheet includes an auto-inserting date. It's not the best, but it works for me.