The best alternatives to Madefire are Tapastic, GlobalComix, and New Syntopicon. If these 3 options don't work for you, we've listed a few more alternatives below.
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GlobalComix is a digital comics publishing platform that enables comic creators and publishers to upload, publish, translate, and monetize their content to a global audience.
Read and explore better. Key ideas in books converted to graph nodes (+ complete list of their mentions) so you can explore how they are connected to texts and to each other. Trace, read, and participate in the conversations that have defined our civilization