On this page you can find specific DebianPackages able to replace Windows programs.
For additional info search http://www.debian.org/distrib/packages for the names of the windows equivalents and have a look at the following websites:
Office Applications:
Complete suites:
openoffice.org
KDE's koffice
GNome's gnome-office
Components:
Word: OpenOffice.org-writer abiword kword xpw
Excel: OpenOffice.org-calc gnumeric kspread kchart xsiag
Power Point: OpenOffice.org-impress kpresenter prosper
Access: you can include any SQL database (e.g. mysql) into OpenOffice using its ODBC interface
Money: gnucash
http://www.adobe.com/products/acrobat/readstep2.html (if you don't want the English version, select another language).
Web Applications:
Frontpage: quanta
Multimedia Applications:
If you can't find any equivalent package which suits your needs consider RunningWindowsPrograms.