The CompCert formally-verified C compiler
>The files in question are, from a formal verification standpoint, the interface to CompCert. They are licensed under the non-commercial license (NCL) so that they can be used together with the rest of CompCert (the implementation of the compiler, so to speak), which is NCL-only.
>Additionally, the interface files in question are also licensed under the GPL so that they can be used in other, open-source projects such as VST (http://vst.cs.princeton.edu/) that connect with CompCert.
CakeML: A Verified Implementation of ML
CakeML is another formally verified compiler. Notably, unlike compcert, it is open source.
The language it implements (an sml dialect) is high-level and garbage collected, meaning that it is not usable in all of the same domains, but work is ongoing to reuse much of the compiler infrastructure for 'pancake', a low-level language.
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Checked C is an extension to C that lets programmers write C code that is guaranteed by the compiler to be type-safe. The goal is to let people easily make their existing C code type-safe and eliminate entire classes of errors. Checked C does not address use-after-free errors. This repo has a wiki for Checked C, sample code, the specification, and test code.
Wrangling Untrusted File Formats Safely
I don't agree.
Consider WUFFS https://github.com/google/wuffs
WUFFS will give you a C library that can turn PNG data into raw image data and is definitely correct. It's not exactly idiomatic C, you'd assume if a person wrote this code it's probably wrong, but WUFFS promises it's correct. CompCert should turn that C library into executable code which is therefore also definitely correct.
Now, maybe you will screw up code that reads the PNG data from a disk file, or draws the image on a screen, or a million other things, but the WUFFS library components are definitely fine, not just "Bill wrote it and he's got 20 years experience" fine or "It passed the unit tests" fine but "Four Color Theorem" fine.
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