Kick Assembler on the net
A better assembler, Kick Assembler - Review blog on symbol engine
The most sexy assembler - Review blog by Joe Cincotta
CSDB Release 1 - First alfa release on CSDB
POUET Release 1 - The assembler found its way to pouet
C64 Codebase - A great new place to see sources articles about c64 code
The Coding forum on CSDB - The place to disguss new ideas and get help if you are stuck
C64 PROGRAMMER'S REFERENCE GUIDE - A online copy
All About Your C64 Online - A quick reference to the instructionset, registers and memory maps
All About Your 1541 Online - A quick refenrece to registers, jobcodes etc.
Grahams page about the 65xx - It explains the opcodes (also the illegal ones) and some details about the processor. Kick Assemblers names for the illegal opcodes are adopted from this page.
C=Hacking - Lots of interesting stuff and source codes.
Coverts Bitops Rants - Interesting articles and sourcecode on irq loaders, sprite sorting, etc.
Relaunch64 - An editor made for asm cross development which supports highlighting of the Kick Assembler syntax.
Ultra Edit - A popular text editor. However, it's not free.
Eclipse - Eclipse is one of the leading java development evironments. It's free and have all the functionalities you need (+ alot more). Eclipse might be a bit complex for programmers who are not familar with java.
Vice - Emulates C64, C128, Pet, Plus4, etc. A really good emulator.
XMLmind - Big thanks to XMLMind for letting us use their editor, for the manual.