Cross Platform Mobile App Development

There's some new alternative for near native performance out there today:

1. Flutter Beta1 (Dart),
   pros: developed by Google, hot reload
   cons: the Dart programming language have a bit awkward syntax, standard library a bit incomplete compared to other programming languages
2. NativeScript Vue or Vue-Native (Javascript)
   pros: no angular :3, Javascript!
   cons: Javascript! very early
3. GoMatcha (Go)
   pros: Go!
   cons: very early

Sorry but i didn't intend to add ReactNative, personal reason: the error message is too freakin ugly. Also there are some others like Unity3D (for games, inefficient =battery-drain if you use it for static UIs), Xamarin (.NET), Scade (Swift), CodenameOne (Java), Kotlin/Native (Kotlin), Qt (C++), LiveCode (Transcript) and others (especially game engines like: Marmalade with C++/Lua, Corona with Lua) and of course you can choose other Hybrid or HTML5-based ones.

Update 2019-05-07: https://wails.app/ (not native, it's Golang + Javascript)
Update 2020-01-22: SvelteNative, FuseOpen
Update 2020-01-29: UnoPlatform

Cross Platform Game Development

So I was looking for cross-platform game development, found some that are good for Indie game dev development, such as V-Play that uses QML (I like Qt), but the review for the games it produced is quite bad (crashes a lot), so I look another one and found Cocos2D-JS (that has been merged to Cocos2D-X at 2016). To start the development, visit the download page, and choose the full one. Start any web server on that directory.

Need more resource? You can watch this awesome youtube playlist (2014 but still quite relevant), or see the website (warning: mostly broken link) or github for more reference.

Or you might want to try, comparison:

• Godot (GDScript like Python; Web, Android, iOS, Console, Desktop) wikipedia youtube
• MonkeyX (Monkey like Basic; Web, Android, iOS, Console) 
• Love2D (Lua; Web, Android, iOS, Desktop)
• GDevelop (Web, Desktop)
• CoronaSDK (Lua; Android, iOS, Desktop) wikipedia
• MonoGame (.NET; Android, iOS, Desktop) wikipedia
• WaveEngine (.NET; Android, iOS, Desktop) 
• Duality (.NET; Desktop)
• Loom SDK (.NET; Android, iOS, Desktop)
• Starling (AS; Web, Android, iOS, Desktop) wikipedia
• Cocos2D-x (Lua, Js; Android, iOS, Web, Desktop) wikipedia youtube

Actually I want to write this page as Cocos2D tutorial, but for my current project I need engine that can run under a WebView component, so here's the alternative:

• SuperPowers HTML5 (Js; Web, Android, iOS, Desktop) youtube youtube youtube
• Phaser.io (Js, Ts: Web, Cordova, NWJS) youtube youtube youtube youtube youtube youtube youtube youtube editor
• Panda.JS (Js; Web) youtube 
• CraftyJS (Js; Web)
• PixiJS (Js; Web) youtube youtube youtube youtube
• MelonJS (Js; Web) 
• KiwiJS (Js; Web) youtube
• QiCiEngine (Js; Web) youtube
• StageJS (Js; Web)
• EnchantJS (Js; Web) youtube tutorial
• LimeJS (Js; Web) youtube

I think QiCiEngine (built on top Phaser.io which built on top PixiJS) is quite awesome, lot's of examples, too bad that WebGL that used by Pixi must use Android Lolipop. There's some people that review those engines (see the recommended videos next ot that video). Also you may want to see TileD to help you edit the stages.