msolve and its functionality is available in Julia via the package 
AlgebraicSolving.jl. Running your Julia REPL apply the following steps:

using Pkg

Pkg.add("AlgebraicSolving") # for stable version
or
Pkg.develop("AlgebraicSolving") # for developer version

Moreover, msolve functionality is available via the Computer
Algebra System OSCAR in Julia. Running your Julia REPL apply
the following steps:

using Pkg

Pkg.add("Oscar") # for stable version
or
Pkg.develop("Oscar") # for developer version