Version 6.0 of the
calibre ebook management system is out.

It has been a year and a half since calibre 5.0. The headline
feature is Full text search, calibre can now optionally index all
the books in your library so you can search your entire library for
a word or phrase.

Other changes introduced since 5.0 include 64-bit Arm support, the removal
of 32-bit support, and an update to Qt 6.

Source: LWN.net – Calibre 6.0 released