Electra

Electra for iOS 11.0 - 11.1.2
Electra is a semi-untethered jailbreak for devices running iOS 11.0 - 11.3.1. The first beta was released on January 13, 2018. Several betas were released. The betas did not include support for Cydia. The developer, CoolStar then seeded six release candidate versions to developers with working Cydia support. He made the first full release on February 26, 2018.

Electra for iOS 11.2 - 11.3.1
With Electra's update to support devices running any iOS between 11.2 to 11.3.1 (including betas), delays came in place due to Apple's mitigations remounting the root filesystem that was introduced in iOS 11.3. There are many tweaks that need to do certain things within the filesystem, and because of Apple's mitigation, a APFS remount workaround was needed to complete the jailbreak. Chinese security researcher Min Zheng had already found and created his own bypass to remount the root filesystem which many other developers had tried to implement in their own way. During this time Jonathan Levin who created LiberTV jailbreak for AppleTV was announcing his plans for updating LiberTV for a APFS remount which the Electra Team could use. Coolstar had already found a 0day in APFS which would allow this APFS remount become a reality but wanted to save it just in case for iOS 12. As this news was seen by the community, many people where angry that Coolstar wanted to delay the update for Electra and save the 0day. Coolstar had found another 0day and decided to end the relying on Levins remount and use one of his APFS 0days instead. Later on the updated Electra was released on July 6, 2018.