graphics - Creating a GIF animation from PNG files - Unix & Linux Stack Exchange

Is there a tool to create a gif animation from a set of png files? I tried the convert command from the ImageMagick suite, but this doesn't always succeed. Also, I have several issues with this:

graphics - Creating a GIF animation from PNG files - Unix & Linux Stack Exchange

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Unix & Linux: Creating a GIF animation from PNG files (6 Solutions!!)

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