You can get the download links and information about the most popular iOS 15 - iOS 15.0.2 jailbreak or jailbreak alternative methods as follows.
Checkra1n Jailbreak not available for iOS 15 jailbreak yet. Also, this is compatible with iPhone 5S to iPhone X only and no latest device support. If you are a jailbreak expert, you can try this method from Checkra1n official site.
Here are some trusted jailbreak alternative methods for iOS 15 - iOS 15.0.2 running all devices.
Zeon is based on the repo extracting method and designed especially for iOS 14. It is now upgraded for iOS 15 & higher jailbreak too. It has added new sources to add more 3rdparty tweaks on iOS 15 - iOS 15.0.2.
Zylon is a newly released third party community based development iOS 14.3 onwards. Now Zeon is available on the Zylon app store too.
This is the currently only jailbreak solution for iPhone XS, XS Max, Xr, iPhone 11, iPhone 11 Pro, iPhone 11 Pro max, iPhone 12, iPhone 12 pro, iPhone 12 pro max.
Hexxa plus is a trusted iOS 15 - iOS 15.0.2 Jailbreak solution.
This will allow you to install Jailbreak / 3rd party apps by extracting repositories / sources.
It has thousands of Jailbreak and 3rd party apps / tweaks with these repos.