"app-UI is a free & open source collection of reusable "application container" user interface components that may be helpful to web and mobile developers for creating interactive applications using HTML and JavaScript, especially those targeting mobile devices."
That's one loooooong sentence to start off your page with. Further, it seems like you're scared of diving into the mobile "niche." Embrace the niche. Try this, maybe?
"app-UI: Native-looking mobile application containers for HTML and JavaScript."
"app-UI is a free & open source collection of reusable "application container" user interface components that may be helpful to web and mobile developers for creating interactive applications using HTML and JavaScript, especially those targeting mobile devices."
That's one loooooong sentence to start off your page with. Further, it seems like you're scared of diving into the mobile "niche." Embrace the niche. Try this, maybe?
"app-UI: Native-looking mobile application containers for HTML and JavaScript."