Perhaps the most robust alternative. The free version includes "Fusion," a professional-grade node-based compositing tool that is more powerful than After Effects CS6.
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Blackmagic Design’s DaVinci Resolve is not just a color grading tool. Its “Fusion” page is a node-based compositor that rivals After Effects’ layer-based system. The free version has no watermark, no trial period, and includes: Perhaps the most robust alternative
Adobe After Effects CS6 is a powerful video editing and visual effects software that's widely used in the industry. While it's no longer the latest version (Adobe now offers After Effects CC as part of Creative Cloud), it's still a great option for those who prefer a one-time purchase or have specific workflow requirements. Here are a few options: Blackmagic Design’s DaVinci