External Application Button allows you to define highly customizable toolbar button and context menu items for Opera browser. Using this application for instance you can send current page to Chrome, Firefox, or Internet explorer browsers. Or send selected text to a text editor like Notepad++ or Sublime Text. It is even possible to directly send image URLs to a photo editor of your choice or send download links to an external download manager like FlashGot extension in Firefox.
Note that in order for this application to work, there is a minimal native client that needs to be installed manually. Instruction on how to install the minimal client is shown once an application is added to the list. For more info watch the video tutorials or visit add-on's homepage.
Linux and Mac: https://www.youtube.com/watch?v=bB4Bj_APg4g
If you have a question regarding this application or need help integration this application to an external executable please post your question in the discussion section of add-on's homepage