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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.
I saw this tool mentioned recently along with the release of https://github.com/ExOK/Celeste64 . It's mentioned as a tool that was used during Celeste64's development so it's clearly not just for Quake engine based games.
Celeste64 uses https://github.com/LogicAndTrick/sledge-formats which include loaders for Quake formatted maps. It could be using the Quake format for a different engine.
For tech3 based stuff, maybe try Netradiant (forked from GtkRadiant), or more specifically its fork (!) NetRadiant Custom (https://github.com/Garux/netradiant-custom).