You can download tons of C64 music from the High Voltage Sid Collection. If you like remixes of c64 tunes, C64 Audio is a great place to download c64 music in midi and MP3 formats. Another good place to get c64 midi music is the Commodore 64 Midi Gallery. Also take a look at remix.kwed.org for some more great MP3 covers of c64 tunes, Chimera is definitely my favorite one. Another great source for c64 music is Slay Radio which features streaming c64 remixes in MP3 format. If you're using a windows version of the SID-Player you might want to take a look at Gamebase64 for a nice frontend to use with it.
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Visit the Fairlight C64 Tool List for just about every utility imaginable.
D64 Editor - My own Windows based D64 Editor.
64Copy - The most complete C64 Disk Editor available.
Star Commander - Probably the best program to transfer files between your PC and 1541 drive. It supports the X1541 and XE1541 cables, along with many others.
CBM4Linux - A disk transfer program for Linux. This is the program that I use to transfer disks to and from my real c64, and it works great. You'll need a sleightly modified XE1541 cable to use the program.
C64 Sprite Ripper - A very useful program for ripping the sprites from c64 programs into PC image files.
ConGo - A great program for manipulating c64 picture formats, with newly added support for disk images.
D64 Lister - A windows based program to display the contents of your D64 files with strong support for GEOS files.
Trans64 v1.25 - Another transfer program for the PC, unfortunately it hasn't been updated in a very long time and only supports the X1541 cable and does not support the XE1541 cable. If you get a runtime error when trying to run Trans64, download a copy patched for 686's.(307k)
LHA v2.55 - This program is used to decompress files with an .LHA suffix. Hold down "shift" to download. (65k)
Zip2Disk - Occasionally you may come across a file that is in four numbered parts that start with 1!, 2!, 3!, and 4!. This program will convert the four files into a .D64 file. (15k)
Disk2Zip - The opposite of the above program. This program will convert a .D64 file into C64 zipcoded files with the four numbered parts. (15k)
Unlynx - This program is used to decompress files with an .LNX suffix. (19k)
D642T64 - Program to convert files on a .D64 image into .T64 files. (11k)
The X1541-series interfaces - Here's the website that you'll want to visit if you plan on building your own transfer cable.
If you don't feel up to the task of building the cable yourself then you should visit The X1541 Shop and they'll be happy to hook you up with one, at a very reasonable price. One additional note, unless you're using a very old computer, like a 486 or earlier, you will more than likely need an XE1541 cable and NOT an X1541 cable. To determine if you can use an X1541 cable or not, run the X1541Test. And when in doubt, send me an email and I'll try to help you find what you need.
COCOS (Commodore Computer Sitelist) - Tons of links to other Commodore webpages, with more constantly being added. You can find pretty much everything related to the C64/128 here.
The Gamebase64 Homepage - A site containing nearly any C64 game that you can think of as part of the Gamebase64 Collection as well as a nice frontend for use with a couple of the emulators and the sidplayer.
C64 Portal - Commodore 64 related news.
The C64 Scene Database - If you're looking for C64 scene releases, utilities and other goodies, find them here.
Lemon - The C64 Game Source - A very good c64 site with lots of c64 related information, including a forum to talk about c64 related things. Definitely worth visiting.
Commodore 8bit Search - A new site that indexes files located on other Commodore related sites.
C64 Preservation Project - A website dedicated to archiving originals with copy protection intact. If you've got a hard to copy disk, this website will help you get it transferred onto the PC.
Games That Weren't - Unreleased or partially finished C64 games.
Commodore Apocalypse - A very good c64 site with quite a few games to download with screenshots and descriptions, some fun c64 puzzles to keep you busy, and some good links to other c64 sites. Overall a superb c64 site.
STADIUM 64 - A very good website dedicated to the sports games on the c64. If you're looking for a sports game chances are you'll find it here.
The C64 Web Resource - Another very good website with current c64 news and lots of games to download.
Arnold FTP Site - This is a huge site with lots of C64 games to download. You'll find that more than a few of the games on this site are corrupt, but there are also many working versions of games here too. Visit the comp.emulators.cbm to learn the latest location of this archive.
C64.COM and C64.ORG - Two very good c64 sites with information, links, games to download, and Sidfind.
Immortal Antiques - The official Remember internet residence. A great group dedicated to cracking the games of old.
Fairlight C64 Tool List - A great source of tools to handle c64 related files on various operating systems.
The Triad Homepage - One of the many groups from the european C64 scene.
Triangle Online - Another european group with lots of info and games to download.
The Living Daylights - Another scene website with music, games, demos and more.
High Voltage Sid Collection - A giant collection of c64 music, here you should be able to find pretty much any piece of c64 music that you are looking for.
The Project 64 Homepage - This site has tons of C64 game manuals in text format.
The C64 Adventure Game Solutions and Walkthrough Site - Solutions to many c64 games.