Underscore.js is described as 'Underscore is a utility-belt library for JavaScript that provides a lot of the functional programming support that you would expect in Prototype.js (or Ruby), but without extending any of the built-in JavaScript objects' and is an website in the development category. There are more than 10 alternatives to Underscore.js, not only websites but also apps for a variety of platforms, including Self-Hosted, Mac, Windows and Linux apps. The best Underscore.js alternative is jQuery, which is both free and Open Source. Other great sites and apps similar to Underscore.js are Handlebars, Jinja, Lodash and mustache.
jQuery is a fast, small, and feature-rich JavaScript library. It makes things like HTML document traversal and manipulation, event handling, animation, and Ajax much simpler with an easy-to-use API that works across a multitude of browsers.
Handlebars is a JavaScript template library that is, more or less, based on mustache . Handlebars adds user defined block expressions and helpers to the standard Mustache template syntax.
Handlebars just covers a tiny part of underscore (the templating) but does it far more extensively.
Jinja is a fast, expressive, extensible templating engine. Special placeholders in the template allow writing code similar to Python syntax. Then the template is passed data to render the final document.
Lo-Dash is a drop-in replacement for Underscore.js that delivers performance improvements, bug fixes, and additional features.
Mustache is a simple web template system with implementations available for ActionScript, C++, Clojure, CoffeeScript, ColdFusion, D, Erlang, Fantom, Go, Java, JavaScript, Lua, .NET, Objective-C, Pharo, Perl, PHP, Python, Ruby, Scala and XQuery.
What is the "E" for? "Embedded?" Could be. How about "Effective," "Elegant," or just "Easy"? EJS is a simple templating language that lets you generate HTML markup with plain JavaScript.
Alasql.js - is a lightweight client-side in-memory SQL database designed to work in browser and Node.js. It supports SQL and has some of NoSQL functionality. It is efficient for JavaScript arrays and objects manipulation with all power of SQL language.
Micro-dash offers a subset of the functionality found in Lodash, with drastically reduced bundle size.
Eta is a lightweight, embedded, pluggable, and super-fast JS template engine. Developed as an alternative to EJS, Eta is more lightweight, faster, and solves several parsing problems (like closing delimiters inside strings, multi-line comments, and left whitespace trimming) with...
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jQuery focusses on DOM manipulation and Ajax, while underscore gives functional tools for working with arrays and objects.