NoMachine have released updated Android and iOS client apps.
This release, analogous with the earlier desktop
release, provides two factor authentication and a number of functional
enhancements which improve remote desktop interaction using both virtual
& external keyboards, as well as via traditional tap events.
Additionally, improvements have been added to enhance the remote desktop experience when connecting to version 3.5.0 servers including better colour rendering and improved finger-tap support.
More information is available on-line.