Firefox
Firefox 4 comes to Fedora 15. In addition to a new look and improved performance, Firefox 4 includes features such as improved password and add-on management, easy protection of your browsing history, and web site identity checking. The synchronization add-in is now part of the base Firefox so you can keep all your bookmarks and password consistent across systems.
For more details refer to http://www.mozilla.com/en-US/firefox/central/
Ledger
ledger is new to Fedora 15.
From the project's github: "Ledger is a powerful, double-entry accounting system that is accessed from the UNIX command-line. This may put off some users, as there is no flashy UI, but for those who want unparalleled reporting access to their data, there really is no alternative."
For more information refer to https://github.com/jwiegley/ledger/wiki
Libre Office
LibreOffice(R) is an office productivity suite that replaceS OpenOffice(R). It is completely open source and driven solely by the community supporting it. It has a word processor, presentation creator, spreadsheet creator, database creator, formula editor, and drawing editor.
recoll
package|recoll, a personal, full-text search tool, is new to Fedora 15. recoll searches most common document types, including compressed files and email attachments. Details may be found at http://www.lesbonscomptes.com/recoll/