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Renaissance

Virtual Renaissance: a school website devoted to teaching about the period.  Includes a good links section.
Want to learn about German armies of the 1400's? Landsknecht.com 
The Mary Rose was an English Warship which sank in 1545 and was raised in 1982. 

Medieval and Renaissance Technology

 

Period Fencing
 These are some of the sites I used in my research for a section on period fencing (in the White Wolf gaming supplement Sorcerer's Crusade Companion).  Olympic fencing resembles period fencing like Lazer Tag resembles a firefight.
William Wilson's intro to the Arte of Defense.
Alfred Hutton's Old Sword Play

Number of links for rapier, smallsword and related items.

TheAssociation for Renaissance Martial Arts  (formerly the Historical Armed Combat Association) is a group of arms and armor enthusiasts and practitioners dedicated to exploring and reconstructing Western martial arts of Medieval and Renaissance Europe.
The Historical European Martial Arts  is dedicated to the almost-lost arts of unarmed combat, dagger fighting and close-quarters sword combat as they were practiced throughout Europe centuries ago. Includes a good links page.
De Re Militari: the society for Medieval military history.

 

Weapons of the Period
Here's a site on the Arquebus and the Matchlock, geared towards reenactors.
myArmoury.com: Resources for historic arms and armour collectors.
"Interpreting" Historical Examples: Thoughts on the Quality of Replica Swords By J. Mark Bertrand

 

Groups
Formed in the mid-1980s, the Adrian Empire re-creates history from the time frame of 1066 through 1603 AD.

 

Gear to Buy
Syke Sutler
Darkwood Armory: Custom swords and daggers from 15th through 19th centuries.
New World Arbalest: Makers of Medieval and Renaissance pattern crossbows.