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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
Elementary OS (https://elementary.io/) probably has the most thorough usage of it, most of their DE and all of their built in apps are written in Vala (as well as most of the 3rd party apps published through their store).
Yes! I also like that a lot. I think Racket has one of the best programming language landing page regarding this criterion: https://racket-lang.org/ :).
I just learned that the Budgie Desktop is written in Vala.
https://github.com/BuddiesOfBudgie/budgie-desktop
Also, on Arch I use Pamac as a GUI for package management and it is written in Vala as well.
I have used apps for quite a long time before realizing they were written in Vala. Not great for marketing but otherwise I would consider that one of its strengths.