Framework7 - is a free and open source mobile HTML framework to develop hybrid mobile apps or web apps with iOS & Android native look and feel. It is also an indispensable prototyping apps tool to show working app prototype as soon as possible in case you need to.
Appcelerator Titanium, offered for free by Appcelerator, lets web developers use web technologies, open source and cloud computing to build native apps for iPhone, Android, Windows, Mac OSX and Linux.Discontinued
On February 2021, Axway announced that Appcelerator Titanium has been discontinued, with support ending on March 1, 2022. All private source code will be made open source by this date. https://www.axway.com/en/appcelerator-end-of-life