For me it's Adobe After Effects. Yeah, I can do most of what it does in a combination of blender, natron, gmic, etc.. but I really like the workflow of AFX. Not having that tool was one of the hardest parts of cancelling my Adobe subscription. Nowadays I would even settle for a non-foss alternative. As long as it's running on Linux. But so far, that has not happened (I use other non Foss tools that work great, like resolve/fusion and Houdini.. but I still miss AFX)
Edit: yeah, I missed a detail in the question: I do not currently use AFX but used it a lot in the past and am now trying to replicate workflows I based on it with other tools.. still miss it a lot and would give a lot to have a solid alternative...
For me it's Adobe After Effects. Yeah, I can do most of what it does in a combination of blender, natron, gmic, etc.. but I really like the workflow of AFX. Not having that tool was one of the hardest parts of cancelling my Adobe subscription. Nowadays I would even settle for a non-foss alternative. As long as it's running on Linux. But so far, that has not happened (I use other non Foss tools that work great, like resolve/fusion and Houdini.. but I still miss AFX)
Edit: yeah, I missed a detail in the question: I do not currently use AFX but used it a lot in the past and am now trying to replicate workflows I based on it with other tools.. still miss it a lot and would give a lot to have a solid alternative...