d20 Resources

Applications

D&D 4e Character Sheet: An online, persistant character sheet. Indeed for use with D&D 4e.
Combat Tracker: Manage initiative order and NPC hit point levels.
Battle Assistant v. 1.1: Allows you to create and manage characters (or NPCs) for different combat situations. Useful for players and DMs alike.
Die Pool* v. 1.0: A World of Darkness die roller app. Works for both old and new WoD games. Default difficulty is 8, uses “10-again” and no botches.
Moon Tracking for Dragonlance v. 1.4.4: Ever had run a Dragonlance campaign and had problems remembering the moon phases? Well this app is your answer! Use for 1st, 2nd or 3rd Edition!
XP Rewards v.1.4b2: Enter in the levels of your PCs. Enter in the CRs of the NPCs. Press a button and XP is calculated for you.
Treasure Horde v. Beta 2: Treasure Horde allows you to save a treasure haul, then divide it between party memebers.
Treasureator v. Beta 1: Allows you to randomly create a treasure based on the CR/Level of the NPC.
Weather: Generate random weather for Silver Marches in the Forgotten Realms

Characters: A collection of links to online resources for Wilson's d20 characters.
Online SRD local: Go straight to the source.
SRD Download: Download a zip file of the SRD in HTML.

* — Not d20.