FactSet

Founded in 1978 by Howard Wille and Charles Snyder

link - factset.com 

2008 - acquired DealMaven
This application has 3 add-ins that will appear in Excel.

Excel Add-in - FactSet Automation and Data Retrieval XLL

folder - C:\Program Files\FactSet\FDSXL32_x64.xll 

Excel Add-in - FactSet Live Code Function

folder - C:\Program Files\FactSet\COMShim_x64.dll 

FactsetLive.RTDFunction.1

COM Add-in - FactSet Office COM AddIn

folder - C:\Program Files\FactSet\COMShim_x64.dll 

Worksheet Functions

=FDS() 
=FDS("EURPLN","FG_PRICE(45348)") 

This function is case sensitive though and will not work if entered as "=fds()"
There is a bug in Excel worksheets that saves the case of the function, the first time you enter a function name.
If the first time you use this function, you type it manually in lowercase, the function will never work correctly in that worksheet.

Dealmaven

Founded in 1999 by Thomas Cadmus
www.dealmaven.com/products/prelink/preslinksamples.aspx
Excel - FastTrack
Word - PresLink
PowerPoint - PresLink