My Toolbox

File Synchronization

Dropbox - Dropbox is a service that keeps your files safe, synced, and easy to share.
https://www.dropbox.com/

Mailer

PHPMailer - Probably the world's most popular code for sending email from PHP
https://github.com/PHPMailer/PHPMailer

SwiftMailer - Swift Mailer integrates into any web app written in PHP 5, offering a flexible and elegant object-oriented approach to sending emails with a multitude of features.
http://swiftmailer.org/

Spreadsheet

SpreadJS - SpreadJS is a JavaScript spreadsheet and grid component that displays and manages data much like Microsoft Excel and includes a forumla engine, sorting, filtering, input controls, data visualiztion widgets, Excel I/O and much more.
http://spread.grapecity.com/Products/SpreadJS/

Handsontable - Handsontable is a data grid component with an Excel-like appearance. Built in JavaScript, it integrates with any data source with peak efficiency. It comes with powerful features like data validation, sorting, grouping, data binding, formula support or column ordering.
http://handsontable.com/