you forgot the link
depends on the demanded functionality, but I’m using Cordova/Phonegap
Cordova/Phonegap (easy to learn, easy to test, easy to deploy)
P.S.: I don’t recommend using RW-Output for Apps. Tried it -> it works, but its finale file-size is way to huge. Also, most (maybe all) theme-dev’s are using cdn’s for stuff like jquery. For an app which should work offline too this isn’t that good. So, coding it by hand, no framework, html/haml, sass/less, coffee/js, is the best practice.
Regarding other services -> Ionic shall be quite good, with a paid account they even offer a drag’n’drop app called ‘Creator’. Every other service regarding this I’ve seen so far was quite disappointxng…