Why is there no uptime for CLIO Parquet?
CLIO Parquet runs on your own machine over stdio — there is no network address to reach, so uptime cannot be measured for it by anyone.
Is CLIO Parquet open source?
Yes — it is published under the BSD-3-Clause licence, written in Python, 26 stars on GitHub and 20 open issues. The source link is on this page, so you can read exactly what it does with your data before you connect it.