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Emu
UI for GameMaker. Looks like Windows Forms. Use this if you're not making a game, or otherwise if you want your game to look like tax software or something. (by DragoniteSpam)
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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.
You can see some GUI stuff here in an older project I made: https://github.com/badwrongg/gms2stuff/raw/master/CRT_Shader.yyz
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.