Group Merge
Open-sourced add-on to send personalized emails based on Gmail template to multiple recipients. The unique Group Merge feature allows sender to group multiple contents for the same recipient in one mail.
axe-scan
A CLI tool to test web accessibility on multiple web pages based on a list of URLs in a text file. Run on Node.js and uses axe-core and Puppeteer as its testing and browsing engines.
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If you prefer to look at the source code, they will always be available as GitHub repositories.