iOS: iOS 9 has been jailbroken for a while, but the smaller software iterations have been relatively untouched. Now, a clunky, Windows-only and Chinese-language-only jailbreak is available for the newest iOS operating system. The jailbreak comes from PanGu, the team behind several of the last jailbreaks, and a team that tends to release jailbreak tools that are rough around the edges. In this case, the 9.3.3 jailbreak is only available for Windows and is in Chinese. It's also considered "semi-tethered", which in this case means that any time you reboot your phone, you'll need to run an app on your iPhone that jailbreaks everything again.
The good news is that PanGu's tool is not particularly complicated to use and the tool only requires a few clicks to actually use. This Reddit thread has a full text guide for the jailbreak process, or the video above from 9to5Mac walks you through the process. At this point, you'll likely want to wait a little while for the bugs to get worked out, but if you're clamouring for that jailbreak right this second, it is doable.