Titania Tools is my new suite of chess tools for Windows. Its first GUI, PGN Simple Edit, reports on, joins, merges, splits, and sorts PGN files. It works with whole files rather than editing individual games. PGN Tools (PgnTools) is my older program and remains available below.
Databases, analysis suites, engine tools, and utilities for turning chess images and scoresheets into usable game data.
Converts chessboard images to editable FEN positions and handwritten scoresheets to PGN games, with review and correction before export. Also offers browser-based analysis and PGN tools. Scanning requires an account and uses credits, with free starter credits on sign-up.
GUI and command-line tools for running matches and tournaments between chess engines. The de facto standard for engine testing.
The leading commercial database and analysis suite, with huge game collections (Mega Database) and deep engine integration.
Shane's Chess Information Database — a free program for storing, searching, and studying large collections of games.
An actively maintained fork of SCID with a refined interface, gameplay, and analysis features. An excellent free database for most players.
The SCID project's own hub of compatible add-ons — game databases, player data (ratings and photos), opening books, engines, and endgame tablebases.