gtranslator has got many, many features, but these are the mainly important ones:

• Highly customizable syntax highlighting (colorschemes are in xml and very easy to write).
• Different views of po files are supported.
• In-GUI compiling of the po file.
• Instant, customizable spell checking (ispell-based).
• Advanced history/recent files menu with project name & version -- not only the filename like other apps do it.
• Very comfortable header editing with selection boxes and automatical change of the other fields corresponding to your current selection.
• Opening of compiled (.gmo/.mo) gettext po files and compressed gettext po files is directly supported (open your gnumeric.mo and edit it to make your individual translation!).
• Navigation within untranslated/fuzzy messages.
• Update functionality with the help of xml-i18n-tools/gnu-i18n-tools.
• Query capability to search for already made translations in the gettext domains.
• Autoaccomplishment of found translations from the default query domain.
• Autofilling of po file headers with the entries from the preferences (never edit header comments again).
• Full D'n'D support and session awareness, therefore good integration into your GNOME desktop.
• Find/replace dialogs/functions.
• HTMLizer function which converts your po file into a syntactically highlighted html file to allow web-viewing of your po files.
• Old, obsolete entries can be kept if you wish to keep them.
• Status indiciation through status bar and progress bar.
• Docbook- & Scrollkeeper-enabled help which does also appear in the Nautilus help sidebar.
• URI support for all cases; opening of remote URL's is also supported.
• Signal handling which makes it possible to rescue po files which couldn't be saved due to a crash/interrupting/etc. in gtranslator -- loose less work with gtranslator!
• UTF-8 po files editing (in versions >= 0.39).
• List view for message which is very comfortable and sortable (it's based upon ETable/ETree from GAL).
• Personal learn buffer to support auto accomplishment with personal/learned translations from an UMTF file.
• Very comfortable messages table with colored, grouped display of the messages: group headers also show up the resting messages count.
• Useful undo for deletion, insertion.
• Importing from/converting to UTF-8 is possible from the GUI.
• Direct taking over the msgid as the msgstr.
• Enhanced learn buffer techniques added ("fuzzy" matching routines with a grade of voodoo).
• Messages table popup menu with translation look up for untranslated and fuzzy messages with the possibility to insert/take over the found the translation found in the learn buffer.
• pozilla !!!