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buildroot
Buildroot, making embedded Linux easy. Note that this is not the official repository, but only a mirror. The official Git repository is at http://git.buildroot.net/buildroot/. Do not open issues or file pull requests here.
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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.
An embedded system like Roku doesn't need to "run everything", it just needs to run their "platform", which is probably quite small. It's pretty trivial to assemble your own OS from "off-the-shelf" components. You can use something like buildroot to spin up a new OS in half a day, using only the components you want. You can also use "smaller" components that have far fewer features, meaning less bugs and less updates.