Is there a formally-proven real-time language/computing env. or operating system?

This page summarizes the projects mentioned and recommended in the original post on /r/ProgrammingLanguages

Stream - Scalable APIs for Chat, Feeds, Moderation, & Video.
Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.
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InfluxDB – Built for High-Performance Time Series Workloads
InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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  1. seL4

    The seL4 microkernel

    Look into seL4 and in particular, it's MCS (Mixed-Criticality Systems) extensions for real time.

  2. Stream

    Stream - Scalable APIs for Chat, Feeds, Moderation, & Video. Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.

    Stream logo
  3. cakeml

    CakeML: A Verified Implementation of ML

    There is also Cake ML which is a formally verified functional programming language compiler and runtime.

NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.

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