Calibre是一款开源免费的电子书管理程序，由国外高手KOVID GOYAL编写。Calibre 4.0 主要的一个变化是 Content server 使用的 web 内容渲染引擎从 Qt WebKit 迁移到 Qt WebEngine，原因是前者不再维护。
切换到 Qt WebEngine 也使得 Calibre 重写了电子书浏览器、PDF Output 等组件，Content server 加入了元数据编辑、电子书移除和添加，转换到所有支持格式等功能。
因为渲染引擎发生了变化，因此部分功能不再兼容。
Release: 5.7.2 [12 Dec, 2020]
New features
Bug fixes
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PDF Output: Fix a regression in the previous release that broke text rendering for some fonts due to a bug in Qt WebEngine (full fix is in 5.7.2).
Closes tickets:?1905967
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PDF Output: Fix conversion failing when adding header/footer and the input document defines margins/padding on the <html> tag.
Closes tickets:?1905736
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Windows: Fix the case of library names in copied calibre:// links sometimes incorrect.
Closes tickets:?1907159
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AZW3 Input: Fix a regression in calibre 5 that broke processing of files with inline flow replacements.
Closes tickets:?1906459
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Fix hiding and showing book details panel changes its size by a pixel or two.
Closes tickets:?1906149
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Get books: Fix amazon.fr not working because of website changes.
Closes tickets:?1907067
- Bulk metadata search/replace: Fix text transform function not being applied to the test result in character mode
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Book list: Improve rendering of column headers when they dont fit, by eliding them instead of just cutting off rendering.
Closes tickets:?1906464
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Fix template function “first_non_empty” fails if no argument evaluates non-empty
Closes tickets:?1906063
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Fix regression in 5.7.0 causing failure to start if one of the previously used libraries had a stored path ending in a slash.
Closes tickets:?1907773
Improved news sources
- The Guardian
- The Atlantic
官网地址：https://calibre-ebook.com/zh_CN
Calibre v5.7.2官网下载链接：Windows 32位 / 64位 | Mac
Calibre 4.0官网下载链接：Windows 32位 / 64位 | Mac
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