DIY kits There are 2 products.

SeeedStudio Grove System

Please check https://www.seeedstudio.com/getting-started.html https://wiki.seeedstudio.com/Grove_System/

What is Grove?

Grove makes it easier to connect, experiment, and simplify the prototyping process. No jumpers or soldering required. Seeedstudio have developed more than 300 Grove modules, covering a wide range of applications that can fulfill a variety of needs. Not only are these open hardware, but they have also open source software to offer.

The SparkFun Qwiic Connect System is an ecosystem of I²C sensors, actuators, shields, and cables that make prototyping faster and less prone to error.