Vue Storefront 1 was the first complete PWA released in the Magento open source landscape. I heard about it for the first time at the Reacticon conference in 2018, and I fell madly in love with it.
The Hyvä React Checkout is one of the nicest open source things the Hyvä team has developed in recent years. As mentioned in the readme, it’s not a ready-to-use module, but rather a fast and flexible tool to build a custom Checkout for Magento2.
Four years ago, during my PHP period, I released my first open source project: Fast titles.
It was a small tool for importing Final Cut subtitles via xml. In fact (sounds strange) the most famous video editing platform in the world doesn’t have a system to import massively subtitles, you have to insert them one by one, one per clip. A big waste of time.