Xiphos (formerly known as GnomeSword) is a Bible study tool written for Linux, UNIX, and Windows under the GNOME toolkit, offering a rich and featureful environment for reading, study, and research using modules from The SWORD Project and elsewhere.
BPBible is a free, flexible Bible Study tool. It is designed to be easy to use.
Bible application BPBible has many of the features you would expect in a Bible application – Bible, Commentary, and Dictionary support, Bible Search, Scripture tooltips, etc. Cross verse searching BP.Discontinued
The project seems abandoned. Last version, 0.5.3.1, released in April 2016, can be still downloaded from Github
BibleTime is a completely free Bible study program. The programs user interface is built with Qt framework, which makes it run on several operating systems including Linux, Windows, FreeBSD and Mac OS X.
The SWORD Project is the CrossWire Bible Societys free Bible software project. Its purpose is to create cross-platform open-source tools-- covered by the GNU General Public License-- that allow programmers and Bible societies to write new Bible software more quickly and easily.