Material hosting quasiparticles acting as Weyl or Dirac fermions offer unique quantum phenomena which could be exploited in a completely new generation of electronic device. These materials are in general called topological semimetals, which differentiate from the topological insulator by hosting directly in the bulk band structure massless excitations, and not only at the surface. In this ongoing project we are characterizing different compounds with aim to discover new topological semimetals and explore the possible tunability of their topological phase by alloy engineering.