Software

Blue Wizard
Includes survey, screenshot, help, and updates for the deck creation and management software.
http://home.hetnet.nl/~fam-wehrens/bluewizard/

The Complete Magic Database
A multi-functional information system. Detailed information on every card and a tool for planning effective decks, and tracking inventory. (Requires Javascript)
http://cmd.reinkvist.dk/

Magic Analyst
A sophisticated freeware database for MtG deck builders and collectors. The Magic Analyst is a virtual library of all the cards ever printed, making it easy to catalog and appraise your collection, find key cards, and construct better decks.
http://www.gmks.com/MAGIC/Analyst.html

Magic the Creation
Create printable cards by filling in an online form.
http://wwwhome.cs.utwente.nl/~oosting/basic/magic/

Magic the Database
Freeware application database program for game enthusiasts and collectors. Designed to track card collections, create and build decks. Search queries and query scripting capability.
http://www.magicdb.net

The Magic Workstation
A freeware package designed to enable online play of Magic: The Gathering. It also includes features to assist with deck construction and card inventory.
http://www.magicworkstation.com/

MTG Studio
A freeware application for deck construction, multiplayer, and net draft.
http://www.palmroot.com/

MTG Studio
Magic the Gathering Deck Editor
http://www.mtgstudio.com