GoldenDict

Feature-rich dictionary lookup program.
* Use of WebKit for an accurate articles' representation, complete with
  all formatting, colors, images and links.
* Support of multiple dictionary file formats:
  * Babylon .BGL files
  * StarDict .ifo/.dict/.idx/.syn dictionaries
  * Dictd .index/.dict(.dz) dictionary files
  * ABBYY Lingvo .dsl source files
  * ABBYY Lingvo .lsa/.dat audio archives
* Support for Wikipedia, Wiktionary or any other MediaWiki-based sites
* Scan popup functionality. A small window pops up with translation of a
  word chosen from antoher application.
* And much more...