I review the possible measurements that can be used to better constrain the CKM unitarity triangle parameter $\gamma$ (also known as $\phi_3$). These include: the approach to perform unbinned model-independent Dalitz plot analysis of the $B\to DK$ transitions followed by $D\to K^0_S\pi^+\pi^-$ decay; double Dalitz plot analysis of $B\to DK\pi$, $D\to K^0_S\pi^+\pi^-$ decays; measurements with four-body $D$ meson decays, and quantum-correlated analysis of $\chi_{c1}(3872)\to D\overline{D}$ decays.