Almost every web designer/developer, one way or another, faces data loss & experiences the importance of taking regular backups.
Backup2Mail is a free PHP script which easily prevents this problem by automatically backing up MySQL databases & e-mailing them to a given address.
It requires PHP 4.1+ to run & for scheduling the script, cron jobs (Unix/Linux) or a scheduled task interface (Windows) is required.
siwapp is an open source web application, built with PHP (Symfony), that enables anyone to create & manage invoices with ease.
The application has a slick interface & provides a simple usage to create professional-looking invoices.
siwapp uses MySQL to store data & if you need periodical invoices to be e-mailed automatically, a scheduling system (like cron) must be used.
It can also work as a module (be integrated to other business management applications) with the API support.
Almost every Twitter user needs the ability of scheduling tweets. There may be a tweet that you need to send later or you may want to Tweet 7/24 but you must sleep as well 
.
Although there are web based services which enable you to schedule tweeting, you may not want to give your Twitter password.
Here comes ScheduledTweets. It is a 100% free web application to schedule your tweets that you can install into your web hosting account.
ScheduledTweets is built with PHP, uses MySQL to store the data & its interface is fully Ajaxed.
It enables you to define time-intervals which your tweets will be sent every x minutes. You can enter unlimited tweets, drag’n drop your tweets to change the order they will be sent.
Also, URL shortening service TinyURL is integrated for shorter tweets.
ScheduledTweets comes with a web-based friendly installer that helps you define database & Twitter information easily.
