FactSet

Founded in 1978 by Howard Wille and Charles Snyder

link - factset.com 

2008 - acquired DealMaven

FactSet Excel Add-in

fdsxl32.xll

FactSet Automation and Data Retrieval XLL (Excel add-in)

FactSet Live Code Function (Excel add-in)

FactsetLive.RTDFunction.1

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 save 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.

FactSet Office COM AddIn (COM Add-in)

Dealmaven

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