A tool to diff and merge Salesforce metadata across orgs.
For your health and safety you should deploy this on your own Heroku environment:
Fill in the required fields. For FORCE_CONSUMER_KEY and FORCE_CONSUMER_SECRET you will need to create a connected app in any organization on Salesforce. The Callback URL will be https://YOUR_HEROKU_APP.herokuapp.com/_oauth_callback (replace YOUR_HEROKU_APP with the Heroku app name you select or are assigned).
For demo purposes try out the Salesforce Metadata Merger Demo.
Right now the Salesforce Metadata Merger only supports Apex classes. If you need additional metadata types, file an issue.