Learn Jazz Standards Online

This website is a plethora of information for all things jazz. Including: 

• playalong tracks for jazz standards PLUS chord charts.

• several reference recordings for jazz standards

• instructional blog and videos to improve all aspects of playing and learning jazz

• FREE practice guide to learning how to solo.

https://www.learnjazzstandards.com/ 

iReal Pro

This is a terrific app, although it does cost money.  This app is widely used by music professionals!  It provides backing tracks and chord charts for just about any jazz or pop standard that's out there.  What's super cool is that you can change the key, speed, and even accompanying instruments!  If you want to learn how to play by ear and improvise, this is a must-have.  

https://www.irealpro.com/