Oracle have (at the regional Oracle CloudWorld event in Singapore) just announced Oracle Database 23c Free Developer Release. If you are familiar with Oracle Database, you will know all about Oracle Database XE. This announcement is effectively a replacement of what would have been Oracle XE 23, built and made available with developers in mind. Ultimately, this new offering gives developers "early access" to build new applications, enhance or upgrade existing applications using all of the new features that 23c offers.
Javascript
Oracle JET – Getting Started
Oracle JET is an open source toolkit developed by Oracle which can be leveraged to build enterprise applications in JavaScript. It's important to identify that Oracle JET is not a framework, only a toolkit. ...But, what does that mean? well, you can't just swap out Angular or React (or the many other JS Frameworks) for Oracle JET! Instead, application developers can pick and choose thoroughly tested, modular components from the toolkit (cookbook!) that leverage JQuery and KnockoutJS and weave them into their application development - code snippets, if you like. Recent versions of JavaScript, HTML5 and CSS3 architecture principles are quickly established.
AMY SIMPSON-GRANGE - BLOG 