abseil-cpp but packaged for Zig.
Used by protobuf packaged for Zig.
zig fetch --save git+https://github.com/allyourcodebase/abseil.git
You can then access the available libraries and executables like this:
const abseil_dep = b.dependency("abseil", .{
.target = target,
.optimize = optimize,
});
// libabseil
const libabseil = abseil_dep.artifact("libabseil");