[$] Fil-C: A memory-safe C implementation

Fil-C is a memory-safe implementation of C and C++ that aims to let C code —
complete with pointer arithmetic, unions, and other features that are often
cited as a problem for memory-safe languages — run safely, unmodified.
Its dedication to being 'fanatically
compatible' makes it an attractive choice for retrofitting memory-safety
into existing applications. Despite the project's relative youth and single
active contributor, Fil-C is capable of compiling an
entire memory-safe Linux user space (based on

Linux From Scratch),
albeit with some modifications to the more complex programs. It also features
memory-safe signal handling and a concurrent garbage collector.