Post-OFDM waveforms are foreseen as key enablers for a highly flexible air interface that addresses the heterogeneous requirements of advanced 5G services. Three promising candidate waveforms are demonstrated by Fantastic-5G using real-time hardware platform: Flexible Configured (FC)-OFDM, Universal-Filtered (UF)-OFDM, and Filter Bank Multi-Carrier (FBMC), in collaboration between Telecom Bretagne, Orange and Nokia Bell Labs. The demonstration illustrates how we were able to reduce the hardware complexity of these new waveforms, which becomes mostly equivalent to state-of-the-art OFDM used in 4G, while bringing new opportunities to enable 5G scenarios such as vehicular communications with high velocity of user device and Machine type communications with relaxed synchronization.