Artha is a handy thesaurus based on WordNet with distinct features like global hotkey look-up, passive desktop notifications, regular expression based search, etc.. Artha may be used as a free open-source replacement to the proprietary WordWeb Pro.

Notes:
To build from source, Artha requires GLib (>= 2.14), GTK+ (>= 2.12) 
and WordNet with its development headers (>= 3.0). For building it on Windows 
refer INSTALL file.

If you are using the Debian package, make sure you use the
'gdebi' command to install it and not the 'dpkg' command
(as it doesn't resolve dependencies). On most Debian based
distros, gdebi-gtk comes pre-installed. If so, you can
straight away double click the .deb file to install. It
will install resolving the dependencies. If you go by the
CLI way, here is an example:

e.g. $ sudo gdebi artha_1.0.1-1_amd64.deb

Also, make sure you have 'Universe' included in the
repositories list (Software Sources).

Change Log:
	* Ported code to Win32 ~ added alternative code for special cases like 
	  hotkey hook, selection capture, single instance check, etc.
	* libnotify for Win32 (shared library) written from scratch
	* Notification lookups are made a lot lightweight so that the notification 
	  turnaround is much quicker; a proper lookup is made only on a window show
	* If the user has disabled hotkey in prev. run, registers a new one in 
	  current run, then the hookup doesn't happen. This is fixed now.
	* On a futile look-up, notification shows the incorrect term now
	* Query combo box mnemonic (Alt + Q) bug fixed.
	* Fixed indirect dependencies (gold linker deb issue: 553965)
	* Fixed incorrectly named "sense.index" to "index.sense" 
	  (deb issue: 571948)
	* Fixed a crash on looking up ".", "-" and "_" (lp issue: 531475)