Complete X-Files Episode Guide
Episode listing in an easily digestible table format. Cataloged by director and writer and including a compilation of ratings from various reviewers, guide gets a bit patchy from season five onwards.

Al's X-Files Page
Brief episode guide, with air dates, writers and directors and short descriptions, finishing up with season seven.

Norman Lim's X-Files Episode Guide
Episode and cast list, through part of season 7.

Pazsaz Entertainment Network: X-Files Episode Guide
Complete episode listing.

Inside The X: X-Files Episode Transcripts Archive
Complete and detailed list of transcripts for every episode. Most transcripts are also available in PDF format.

Red Wolf's X-Files Episode Guide
Summaries, quotes and a crosslinked cast list for the entire series through to season seven.

CampusNut.com: X-Files Episode Guide
Reviews of season eight episodes with a bias towards David Duchovny.

Phil's X-File Page
Brief episode listing for the first four seasons.

Generation Terrorists X-Files Quotes
Quotes up to season six.

XUK6
Brief listing of seasons 1-5, with a more comprehensive sixth season episode guide that includes pictures, links and commentary.

CarriK's X-Files Episode Transcripts
Detailed transcripts of episodes up to season eight from CarriK.

Hu's Episode Guides - The X-Files
Cast and crew details, with a brief synopsis on each episode. Complete up until season seven.

Episode List: The X-Files
Episode list and synopsis of all seasons. PlotTracker tool enables cross reference of characters and plot lines.

The X-Files Episode Guide
Searchable database with detailed synopses of all episodes that have aired in the UK, including cast and crew information and US and UK airdates.

Trust No X
Includes summaries, air dates, and cast information.

Conspiracy Theory
Detailed summaries through season 6 and part of season 7. Includes credits and WAV sounds.

ezri's X-Files site
General X-Files site with brief episode guide to all seasons. Also included is a small gallery.