Kotlin is a general-purpose programming language that JetBrains initially designed. It is a statically typed and free, open-source programming language. Today, Kotlin is widely preferred by developers to build Android applications and completely interoperates with Java libraries and Java Virtual Machine (JVM).

Swift is a powerful and intuitive programming language developed by Apple Inc. for iOS, iPad OS, macOS, tvOS, and watchOS, respectively. Moreover, Swift is an open-source programming language. This programming language has evolved over the years with more functionalities for developers to build iOS applications efficiently.

Blockchain is a rapidly evolving field that has witnessed various novel innovations. Non-fungible token (NFTs) is one such phenomenon that has emerged to be of incredible value. In particular, NFTs are digital cryptographic assets that can represent virtually anything, ranging from music, website, video, in-game items in games, digital artwork, and other relevant forms of asset trading.

Node.js is a powerful and open-source JavaScript-based platform. The primary uses of Node.js are to develop applications, video streaming sites, single-page applications, web applications, and online chat platforms, and learning management systems. Node.js has gained immense popularity as it is open-source and completely free to use.