Aquinas Hobor: Affiliated Projects
Verified
Software Toolchain: The software toolchain includes static
analyzers to check assertions about your program; optimizing
compilers to translate your program to machine language;
operating systems and libraries to supply context for your
program. The Verified Software Toolchain project assures with
machine-checked proofs that the assertions claimed at the top of
the toolchain really hold in the machine-language program,
running in the operating-system context. (PDF:
project overview, by Andrew W. Appel)
Concurrent C minor: Connecting machine-verified source programs in concurrent programming languages to machine code via machine-verified optimizing compilers. (PDF: project vision, by Andrew W. Appel)

Mechanized Semantic
Library: Mechanically-verified mathematical techniques for
developing semantic models of program logics and type systems.