Line Number is a small JQuery plugin that adds customizable line numbers to selected paragraphs in your document.
jQuery Plugin For Adding Line Numbers To Paragraphs - Line Number
jQuery Plugin To Display Line Numbers In Textarea - numberedTextarea
jQuery Plugin To Create Textarea With Line Numbers - SetNumber
Show Line Numbers In Textarea - jQuery bcralnit.js
jQuery Plugin To Create Textarea With Line Numbering - LineNumbers
Add Line Number In Textarea - jQuery LinedTextArea