Mate Translate (was Instant Translate) allows you to translate words and phrases between over 100 languages, use text-to-speech, and browse through already-done translations in the history. You can quickly swap languages in the pop-up using Control+S.

Features:

• 100+ languages supported
• Text-to-speech
• Offline history of translations
• Translate in the pop-up window that’s always in the menu bar
• Translate selected text from the context menu
• Open the pop-up with a shortcut
• Autorun as the Mac starts
• Pin the pop-up window above all other windows
• Transliteration
• Insert contents of the clipboard