A collection of links
Smithsonian Jazz History Pages Main Page https://americanhistory.si.edu/smithsonian-jazz
Smithsonian Jazz - Today in Jazz History https://americanhistory.si.edu/smithsonian-jazz/education/today-jazz-history
Birthdays http://jazzbirthdaycalendar.com
The LINER NOTES PROJECT - https://www.thelinernotesproject.com/#/ An online resource for musicians, writers, DJs and music enthusiasts. There's no log-in or personal information or credit cards required. The retired software developer just created the site as a labor of love. You can search by featured artist, musician, producer, writer, song, album title or record label.
Syncopated Times https://syncopatedtimes.com
JazzWax from Marc Myers - writes for WSJ and others https://www.jazzwax.com
A Comprehensive Billie Holiday listing http://www.billieholidaysongs.com/recording-sessions/
JAZZ DISCOGRAPHY https://jazzdiscography.com/ Which has something to do with “Brian,” which is a different way to approach the database - starting with the recording sessions.
Noal Cohen's Jazz History Website Jazz History and Discography https://attictoys.com/
MUSIC CATALOG SITES (which have lots of advertising to slow you down)
DISCOGS - Record Collector / Buy and Sell site with a lot of discography -- https://www.discogs.com/sell/list?genre=Jazz
All Music - Very Comprehensive, many good reviews https://www.allmusic.com/