Calibre 2.21 发布，此版本现已提供下载：http://calibre-ebook.com/download。
更新内容如下：
新特性
Allow opening ebook files and covers in external applications by simply right clicking on them in the Book Details panel.
Tag Browser: Make rename and delete for items in the Tag Browser restrict themselves to the current Virtual Library (if any).
Conversion: Use a new (written from scratch) implementation of CSS Level 3 selectors that fixes various bugs in handling of the more advanced/uncommon CSS selectors such as nth-last-child()
Edit Book: Allow restoring of disabled confirmation prompts in preferences and add a confirmation when removing saved searches
Edit ToC button: Remember the last used ebook formats
Bug 修复
E-book viewer: Fix regression that prevented pasting of text with formatting from the viewer.
Closes tickets: 1428018
Table of Contents Editor: Fix selecting a location inside a file and then clicking on another file causes the previous location to be used in the new file.
Closes tickets: 1428212
DOCX Input: Fix incorrect bold font weight being used for heading styles even if the style definition does not specify bold.
Closes tickets: 1430831
AZW3 Input: Fix a bug that prevented conversion of AZW3 files that contained an empty CSS media block.
Closes tickets: 1426220
PDF Output: Fix incorrect rendering of text in elements that use font-variant:small-caps and also have children.
Closes tickets: 1425094
Get Books: Update Amazon Europe, Empik and CDP store plugins
PDF Output: Fix incorrect conversion of source document that specify dir='rtl' on the root element.
Closes tickets: 1429292
PDF Output: Ignore unparseable links instead of aborting the conversion on them.
Closes tickets: 1429282
Fix reading metadata from filenames tester not working for dates before 1900.
Closes tickets: 1424607
Linux binary install: Fix SSL CA certificates not being detected on Fedora based distributions
Books list: Fix column alignment incorrectly propagating when changing libraries
FB2 Input: Do not put a border around images
Fixes for various incompatibilities with (Py)Qt 5.4.1 which is used by some calibre distro packages on linux
Fix error when running calibredb backup_metadata on a library that contains book records with no path information
Edit Book: Fix extra search being hidden when removing a saved search
Fix a regression in 2.20 that prevented some changes to per-library preferences from being saved
Linux installer: Do not register application/octet-stream as one of the mimetypes calibre can handle
新新闻资源
Pando Daily by Darko Miletic
改进新闻资源
Spektrum der Wissenschaft
New Musical Express
The Daily Mirror
Calibre是电子书管理软件，支持Amazon、Apple、Bookeen、Ectaco、Endless Ideas、Google/HTC、Hanlin Song设备及格式，功能十分强大。
来自:开源中国社区
