Convert Large Numbers Into Words – digit.js
A JavaScript library that converts large numbers (larger than 6 digits) into human-readable words (like 2.1 Million, 5.0 B, etc).
JavaScript & CSS number format
Easy Number Separator For Currency Input
A really simple JavaScript plugin that lets you format a number with a custom character (default: comma) as a thousands separator.
Tiny Number Format JavaScript Library – numer.js
A super tiny (1kb minified) JavaScript library for converting, formatting and manipulating numbers.
Convenient Multi-language Number Formatting Library – numbro
numbro is a robust number formatting JavaScript library used for converting, formatting, and manipulating numbers with support for currency, time, percentage, and much more.
Convert Numbers To Roman Numerals – Romanice
A dependency-free JavaScript library that converts Arabic numbers (1, 2, 3, …) to roman numerals (I, II, III, …) and vice versa.