Source: Epub Secrets
The Sigil editor was not used by everyone in the #eprdctn world and there are those who wouldn’t admit to doing so in public even if behind the scenes they used it to fix things up once in a while. The truth is, however, that with its official demise it marks yet another #eprdctn tool that has failed to move from EPUB2 to EPUB3.
As commonly happens with small open source projects, the weight of development ended up falling on the shoulders of one person, and no doubt the overwhelming task of deciding how to handle the many facets of EPUB 3 forced the development to a standstill.
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