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diffbot
DiffBot is an autonomous 2wd differential drive robot using ROS Noetic on a Raspberry Pi 4 B. With its SLAMTEC Lidar and the ROS Control hardware interface it's capable of navigating in an environment using the ROS Navigation stack and making use of SLAM algorithms to create maps of unknown environments.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I personally went through the hardest way possible and built my robots from scratch and it took 11 years and 3 degrees (BCs, MCs, PhD), but you don't need to go the same way. You can find some kit (for example https://github.com/ros-mobile-robots/diffbot) and start learning linux, bash, C++, Python, ROS, vehicle dynamics, computer vision, soldering and mechanical skills trying to keep this thing alive. It might sound too hard or even impossible, but solving the actual problems of your tiny robot and watching how it's making its first steps would motivate you to push forward. Also you will anyway learn a lot of skills that you will help you in the future.