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Lila
Discontinued ♞ lichess.org: the forever free, adless and open source chess server ♞ [Moved to: https://github.com/lichess-org/lila] (by ornicar)
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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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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
https://lichess.org/
It's the best online chess platform by far - super slick and fast UI, lots modes and tournaments, analysis tools, many of the best players in the world play there frequently. It's open source and completely free, miles ahead of any paid competitor and the team behind it seem to have admirable integrity and just want to make something great instead of selling out.
Valentina (https://gitlab.com/smart-pattern/valentina)
"Valentina is a cross-platform patternmaking program which allows designers to create and model patterns of clothing. This software allows pattern creation, using either standard sizing tables or an individual’s set of measurements."
EPANET (https://github.com/OpenWaterAnalytics/EPANET & https://www.epa.gov/water-research/epanet )
Chances are the water network that's connect to your home was modelled using this FOSS by the US EPA.
Unfortunately, it was probably done using a commercial tool by Bentley or Innovyze/Autodesk but the underlying modeling engine was from the EPA.
OsiriX viewer. I got it to view my before/after CT scans to see exactly what happened in surgery. It's pretty wild being able to see inside yourself.
The site: https://www.osirix-viewer.com
The repo: https://github.com/pixmeo/osirix