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Puts Debuggerer
Ruby library for improved puts debugging, automatically displaying bonus useful information such as source line number and source code.
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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.
Also, learn git so you can check your work in. Files that are not confidential can be posted on github or gitlab.
The web pages for Arch Linux and Gentoo are good. The classic reference site was TLDP, but search engine optimizers have relegated it to the third page of Google search results. LWN archives are free.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.