Chesscafe.com is certainly one of the best chess sites on the internet. This free site contains a lot of very interesting columns, chess lessons and puzzles.
My favorite columns are The Kibitzer by Tim Harding and The Instructor by Mark Dvoretsky, but I also like The Openings Explained by Abby Marshall very much.
Don’t forget to check out the Archives. Here you can find and download all the articles, reviews and endgame studies that have appeared at ChessCafe.com.
The Week in Chess, also known as TWIC, is a nice website with daily chess news and games. The most interesting part is The Week in Chess Magazine, a weekly digest of chess news and games by Mark Crowther.
These games of top-level international chess games can be downloaded as zipped files of games in PGN or ChessBase and form an interesting way to update your database.
With ChessDB, a SCID deriviate, it is possible to download these games from The Week in Chess (TWIC) website and have them converted to a database.
Scid is a free chess database application for Windows, Linux and Mac OS operating systems. It can be used to browse databases of chess games, edit games, search for specific games and produce printable reports on players and openings.
Scid uses its own special three-file database format which is very compact and fast, but it can convert to and from the standard PGN (Portable Game Notation) format.
Scid (Shane’s Chess Information Database) is named after its original developer, Shane Hudson. Currently the development of Scid is continued by Pascal Georges. More information about Scid as well as the download files can be found on the Scid Homepage.
I have mentioned BabasChess before in the post about FICS. BabasChess is a free Internet Chess Client for Windows. It combines ease of use with powerful features for advanced users; integrates a fast and customizable playing environment with a powerful PGN viewer/editor, chess engines support for analyzing positions and amusing chat features.
BabasChess supports many different languages and runs on Windows 95/98/ME/NT/2000/XP/Vista. There is no Linux version, but it can run under Wine, with emoticons disabled.
BabasChess only works with FICS (Free Internet Chess Server), so you are not able to use it to connect to the Internet Chess Club.