calibre is a free and open source e-book library management application developed by users of e-books for users of e-books.

New Features
* Ask for confirmation when stopping running jobs
Closes tickets: 3101 [External link]
* Combine the database integrity check and library check into a single menu item. Also nicer implementation of the db integrity check.
* BiBTeX Catalog: Add option to include file paths in the catalog.
Closes tickets: 8589 [External link]
* Create 'generic' output profiles and generic devices in the welcome wizard
* Bulk metadata edit: Custom column widgets all have an apply checkbox next to them.
* Only use LibraryThing to download metadata if the user provides a library thing username and password. Since LT doesn't like web scraping
* Allow renaming of user categories in the manage categories dialog. Also allow searching for books in a category from the Tag Browser by right clicking ona a category
* Folder device plugin: Add option to disable the use of sub folders
* Allow saving/loading of search and replace expressions in the bulk metadata edit dialog.
* Remeber previously used regular expression in the add books preferences dialog
* Search and replace wizard: Cache the previously used input document.
* Pressing Esc clears the current search in the main book list
* Preselct right formats when using send specific format to device
Closes tickets: 7834 [External link]
* Regex wizard gets find next and previous match buttons
Closes tickets: 4486 [External link]

Bug Fixes
* Do not allow customization of user interface plugins until calibre is restarted
Closes tickets: 8621 [External link]
* EPUB Output: When using preserve cover aspect ratio, use the actual image sizes in the SVG template as otherwise ADE doesn't fully preserve the aspect ratio
* Fix completion on a word with a trailing space causing the first letter to be duplicated in the edit metadata dialog
* PML Input: PML x and Xn tags don't indent properly in TOC. Also handle invalid T markup and retain soft scene breaks
Closes tickets: 6194 [External link] , 8565 [External link]
* TXT Input: Retain whitespace at the beginning of lines. Don't preserve spaces in heuristic processing. Detect and retain soft scene breaks.
* Fix Adding empty book - cover browser doesn't update
Closes tickets: 8557 [External link]
* When generating author sort string ignore trailing Inc.
Closes tickets: 8539 [External link]
* When converting HTML/ZIP files do not leave temporary files that are only deleted on application shutdown.
Closes tickets: 8597 [External link]
* Don't crash if the prefs stored in the db are corrupted
* Catalog generation: Do not use inline-block CSS as apparently Adobe Digital Editions cannot handle it.
Closes tickets: 8566 [External link]
* Fix extra spaces being inserted into TOC title when reading TOC from OPF guide element.
Closes tickets: 8569 [External link]
* Remember window size for bulk metadata edit and catalog generation dialogs
Closes tickets: 8525 [External link]
* Heuristics, italicize common cases: Enhance pattern matching to match punctuation after pattern.
* Fix regression in converting HTML files that have ASCII-encoded non unicode characters inside their