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haxl
A Haskell library that simplifies access to remote data, such as databases or web-based services.
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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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harmtrace
HarmTrace (Harmony Analysis and Retrieval of Music with Type-level Representations of Abstract Chords Entities) is a system for automatic harmony analysis of music.
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PCG
๐๐๐ฎ๐ก๐ค๐๐๐ฃ๐๐ฉ๐๐ ๐พ๐ค๐ข๐ฅ๐ค๐ฃ๐๐ฃ๐ฉ ๐๐ง๐๐ฅ๐ โธบ Haskell program and libraries for general phylogenetic graph search
Probably, the most googled and well-known example of Haskell application in major companies is the Facebook Meta spam filters. Messages containing spam, links to potential malware and phishing attacks are filtered by Sigma, the system that was rewritten in Haskell in 2015. The choice of language was based, among other things, on performance requirements, the need for pure functions and static typing, as well as the possibility of interactive development. The Haxl framework is used under the bonnet, which the company has open-sourced. You can find more details about the development process and technical aspects in the companyโs blog post.
Eaton is a manufacturer of electrical and hydraulic equipment, as well as components for the aviation and automotive sectors. The company is using Haskell for day-to-day tasks such as scripting, hardware simulation, remote control tools for vehicle systems, etc. However, the most interesting thing is that they have entrusted hydraulic elements to the control of code written in Atom DSL, which is also implemented in Haskell. Atom is used to develop hard real-time systems and allows describing declaratively the system state transition rules. During compilation, the tasks are scheduled, which is why the resulting code has a deterministic execution time and constant memory consumption. This makes verification of the obtained code much easier and generally increases the system security, which is, of course, very important in this subject domain. You can read about all this in more detail on the slides and in the Atom repository.
Now letโs jump to an entirely different sphere, that is, the world of music. The service called Chordify allows converting music from YouTube, SoundCloud, etc. into chords so that you could learn to play your favorite songs. Haskell is mostly used during the tracing process; to this end, developers use the HarmTrace library that analyses the sequences of musical harmonics.
The backend of Wire messenger, with the server code publicly available in the companyโs repository and detailed documentation, also written in Haskell.
The American Museum of Natural History uses Haskell to study the phylogenetic graphs reflecting the evolutionary relationships between different species. The code of this project is also available on GitHub.