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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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RPI-Engine
A freely available text-based RPG server derived from an older version of the Shadows of Isildur source code.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
MUDs are a class of game that is terribly underrated. I've played on a few different one (mostly toward the RP focused end of things) but I think the whole family of games shows just how effective imagination can be when coupled solely with text descriptions.
I have extremely strong memories from Shadows of Isildur[1] and met my spouse there!
1. http://www.middle-earth.us/
https://www.beyondallreason.info/
Watch this space, it's already decent and also OSS.
PS: One hill I will die on is games using Discord as forum/wiki like this one does.
https://endless-sky.github.io/
> Endless Sky is a 2D space trading and combat game similar to the classic Escape Velocity series. Explore other star systems. Earn money by trading, carrying passengers, or completing missions. Use your earnings to buy a better ship or to upgrade the weapons and engines on your current one. Blow up pirates. Take sides in a civil war. Or leave human space behind and hope to find friendly aliens whose culture is more civilized than your own.