WebObjects is a Java web application server and a server-based web application framework originally developed by NeXT Software, Inc. As of 2009 the software has been independently maintained by a volunteer community of Apple developers. WebObject's hallmark features are its object-orientation, database connectivity, and prototyping tools.
Objective-C and Swift are the development languages for iOS, Apple’s mobile operating system for the iPhone and iPad. based on the C programming language, with lots of object-oriented features added. Objective-C was originally developed in the early 1980s and influenced the design of Java. Swift is a thorough refinement of the language and the API conventions for the frameworks used in Apple’s macOS, iOS, watchOS and tvOS.
Ruby on Rails is a server-side web application framework written in Ruby under the MIT License. Rails is a model–view–controller (MVC) framework, providing default structures for a database, a web service, and web pages. It encourages and facilitates the use of web standards such as JSON or XML for data transfer, and HTML, CSS and JavaScript for display and user interfacing. In addition to MVC, Rails emphasizes the use of other well-known software engineering patterns and paradigms, including convention over configuration (CoC), don't repeat yourself (DRY), and the active record pattern.
MySQL is the world's most popular open source relational database, supporting SQL-92.