In anticipation of a full release later this year, we note that a release candidate of DB4S 3.13 is now available. We expect this is the final form of the 3.13 release, except for any bug fixes.
Get the 3.13.x-rc1 version from https://github.com/sqlitebrowser/sqlitebrowser/releases/tag/v3.13.x-rc1
The CHANGELOG in the SQLiteBrowser Github repo describes the changes to this version.