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RP-0
Discontinued Realistic Progression One - Career mode for Realism Overhaul [Moved to: https://github.com/KSP-RO/RP-1]
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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.
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ContractConfigurator
A config file based solution for creating new contracts for Kerbal Space Program.
Almost certainly more than you're looking for, but I'd have to say RP-1. It does a good job of turning KSP career into a fairly realistic (but still a game) space race from the 50's-Apollo.
In terms of remaining mostly stock, I'd recommend Kerbalism and Contract Configurator with a few contract packs (second comment has a list) that fit your playstyle.
In terms of remaining mostly stock, I'd recommend Kerbalism and Contract Configurator with a few contract packs (second comment has a list) that fit your playstyle.