Based on our record, Sigil should be more popular than Umbrello. It has been mentiond 23 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Some tools are even available to go the other way and generate UML from code. Umbrello for example. Source: over 1 year ago
This was years ago so I honestly don't remember well, but after some brief googling this tool looks familiar https://umbrello.kde.org/. Source: over 2 years ago
The one time I was forced into making a UML diagram I used Umbrello from KDE: Https://umbrello.kde.org/. Source: over 2 years ago
For UML, I use Umbrello. The biggest advantage is that it can generate Ada code from UML class diagrams. It isn't a perfect code, but pretty good. :). Source: over 2 years ago
Dynamic Draw is portable and runs on Windows. Caligra, Diagramo or Umbrello for Linux. Source: about 3 years ago
Sigil is a gui epub editor that can import those images. Source: 10 months ago
If i’m only doing an ePub, the Sigil ePub Editor (https://sigil-ebook.com/)) has worked well for me (free). Source: 12 months ago
Sigil is the epub creator and editor. https://sigil-ebook.com. Source: 12 months ago
On Mac, you can use Sigil to edit the metadata, and also remove pages. Source: 12 months ago
Another option, better, IMHO, is to download Sigil (https://sigil-ebook.com/), and also download and install the epubcheck plugin for Sigil (https://www.mobileread.com/forums/showpost.php?p=2950625&postcount=1). Then see if Sigil find any issues upon opening your epub, if not, then run the plugin and see if there are any validation issues. The error messages will point at the line of code that is problematical and... Source: about 1 year ago
draw.io - Online diagramming application
calibre - Ebook manager, viewer & converter
LucidChart - LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.
Jutoh - Epub editor, convertor and creator software for Mac and PC.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
Papyrus Editor - Papyrus is a simple online editor to create ebooks.