Useful tools

Productivity Power Tools (lots of tools included here): http://visualstudiogallery.msdn.microsoft.com/en-us/d0d33361-18e2-46c0-8ff2-4adea1e34fef

Studio Styles (changing color theme of editor): http://studiostyl.es/

**For Visual Studio 2012, if installing with the .vsix file doesn’t work, use the Tools >> Extensions and Updates and search for the extension in the Online category and install.

Visual Studio 2012 – Find in Solution Explorer
http://visualstudiogallery.msdn.microsoft.com/d2fc1e94-b85c-4a15-8569-390db1e04f47

Word Highlighting in Visual Studio 2012
http://visualstudiogallery.msdn.microsoft.com/4b92b6ad-f563-4705-8f7b-7f85ba3cc6bb/view/Reviews/2

The fix mentioned in the solution is to download the SelectionHighlight.vsix file then.

Change the Extension to .zip
Open the zip file and edit the manifest file in a text editor.
Change the Visual Studio Version attribute to 11.
After saving the file back into the zip, change the extension back to .vsix

Just move forward with installing the file and you are set.

Accent Occurrences (more customizable than Selection Highlighter)
http://visualstudiogallery.msdn.microsoft.com/2f4627df-98ca-4ce1-9187-8eec7a67ba8c#Details_Tab

Word Highlighting in Visual Studio 2010
http://visualstudiogallery.msdn.microsoft.com/4b92b6ad-f563-4705-8f7b-7f85ba3cc6bb/view/Reviews/2

SpellChecker (only spellchecks non-code non-html): http://visualstudiogallery.msdn.microsoft.com/en-us/7c8341f1-ebac-40c8-92c2-476db8d523ce

Javascript Highlighting
http://visualstudiogallery.msdn.microsoft.com/872d27ee-38c7-4a97-98dc-0d8a431cc2ed

Free PDF Editor (highlights and annotations)
http://www.tracker-software.com/product/pdf-xchange-viewer