KBibTeX allows you to do the following things:
Enter a preamble that defines how special text should be formatted in your bibliography using → → menu item or Main Toolbar.
Choose an entry encoding using Encoding item in Save as dialog or on the File Settings panel.
Enter comments that are not taken in regard by BibTEX using → → menu item or Main Toolbar.
Preview and save bibliography entries in various formats (Source (BibTEX), Source (RIS), Wikipedia, standard (XML/XSLT), fancy (XML/XSLT), and abstract-only (XML/XSLT)) using Reference Preview panel. Additional preview styles become available when bibtex2html is installed.
Search for the bibliography entries data in online databases using Online Search panel.
Find and fix duplicate entries in bibliography using → menu item or Main Toolbar.