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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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SqlQueryStress
SQL query stress simulator created by Adam Machanic http://dataeducation.com/sqlquerystress-the-source-code/
Boss of the SOC (BOTS) datasets: You've already mentioned BOTS v1-3, but don't forget about BOTS v4, which was released later. You can find it here: https://github.com/splunk/botsv4
Elastic Common Data Model (ECS) sample data: Although intended for the Elastic Stack, you can adapt these sample logs for use in Splunk. The repository contains logs from various sources, such as network traffic, security events, and web server logs: https://github.com/elastic/ecs/tree/master/generated/samples
Sample Log Generator: This tool generates synthetic logs that you can customize to fit your needs. While not real-world data, it can be useful for testing specific scenarios or queries: https://github.com/ErikEJ/SqlQueryStress