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FreeCAD
This is the official source code of FreeCAD, a free and opensource multiplatform 3D parametric modeler.
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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.
FreeeCAD - this one you know about. Very capable, but can be a little picky and unforgiving at first. Prepare to rage quit at least once or twice.
SolveSpace - it's a nice program for what it does, but it is kind of limited (no fillets, or chamfers or lofting) so if you run into the limitations, you end up needing to jump to another app anyway.
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.