Depends on the region. MISRA is widely adopted, and then there are the US MIL standards, ECSS for european aerospace stuff, do-178C for aviation..
DO-178c is not a coding standard, it's a process standard. Projects following DO-178c processes would adopt a coding standard as a part of the process, reviewing software deliverables adhere to those standards.
/?hnlog awesome-safety-critical
From https://news.ycombinator.com/item?id=45562815 :
> awesome-safety-critical: https://awesome-safety-critical.readthedocs.io/en/latest/
From "Safe C++ proposal is not being continued" (2025) https://news.ycombinator.com/item?id=45237019 :
> Safe C++ draft: https://safecpp.org/draft.html
Also there are efforts to standardize safe Rust; rust-lang/fls, rustfoundation/safety-critical-rust-consortium
> How does what FLS enables compare to these [unfortunately discontinued] Safe C++ proposals?