If it meant that I could use my old qtz files and that the once thriving community of plugin developers would come back, then I would gladly pay. Apple motion costs $50 and it probably has a smaller user base than the one Quartz Composer once had. Vuo, the Quartz composer alternative created after its deprecation costs $300. Quartz Composer was better than Vuo, had better integration with the OS, a bigger community and was supported by many apps.
E-man
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