- Marvel Comics
- Looksmart's X-Men Listing
- Mutatis Mutandis (cool X-Over summaries)
- The Mutant Pages
- Reprint List
- An Uncanny History
- UncannyX-Men.net
- Wikia Marvel Database (search for any Marvel issue!) - Wikipedia entries for X-Men, X-Factor, X-Force, etc.
- The X-Axis Indexes
- X-Fan
- X-Men Unlimited
- X-Page
- X-Summaries
- X-Title Chronology
- Sandman Issue Summary
- StudioFoglio
- Bolt City (Kazu Kibuishi)
