There are many open-source and free video applications that support Frei0r, a minimalistic plugin API for video effects.

Video Editors
🎬 Kdenlive 🎬 Shotcut 🎬 Flowblade 🎬 LiVES 🎬 Open Movie Editor 🎬 OpenShot 🎬 Pitivi

Video and Multimedia Frameworks
🎬 FFmpeg 🎬 MLT Framework 🎬 GStreamer

Live Video and VJ Applications
🎬 Liquidsoap 🎬 VeeJay 🎬 FreeJ 🎬 Gephex 🎬 Pure Data (PD)

#Kdenlive #Shotcut #Flowblade #LiVES #Openshot #PiTiVi #FFmpeg #MLT #GStreamer #Liquidsoap #VeeJay #FreeJ #Gephex #PD