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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.
If you're comfortable with git and are willing to use the simplest thing that would work, have a look here: https://github.com/driusan/PoormanIssueTracker
https://github.com/driusan/bug is a similar system written in Go. The goal is to use the filesystem in a human readable way, similar to how an organized person without any bug tracking software might, by keeping track of bugs in an issues/ directory, one (descriptive) subdirectory per issue.
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.