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grbl
An open source, embedded, high performance g-code-parser and CNC milling controller written in optimized C that will run on a straight Arduino
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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.
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Bloom
A debug interface for AVR-based embedded systems development on GNU/Linux. (by bloombloombloom)
a basic template for an AVR project
a way to compile from scratch the tools that you may want to use to compile/manipulate binaries for AVR
Note also that, if you are on linux, there's the great https://bloom.oscillate.io/ project, which makes it really easy to debug AVR chips; I had great results and a wonderful experience with Bloom + VSCodium + Native debug plugin, or with CLion.