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1. Master Key is a gem for encrypting data with multiple keys that can be decrypted with any of them

   Ruby 2

2. Simple Ruby web app to slowly stream data at a specified rate - https://git.io/slow-lane

   HTML 2 1

3. Generate currency conversion tables

   JavaScript 1

4. Concurrently update records without locks.

   Ruby 3

5. Partical Collision simulation - https://ciancode.com/particles

   JavaScript