WebInstaller is a website/script installer. It is very similar to an offline installer like installshield or NSIS, but is dedicated to website or script installation.
You can also manage automatic updates using WebInstaller.
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Screenshots of WebInstaller
How does it work?
It’s actually very simple to use: anybody willing to install your product will only need to upload 2 files, setup.php, the installer itself, and content.inc.php, the description of your product.
Then he only need to call setup.php from his web browser.
Setup.php will then automatically retrieve the files to install from your own website, and run the extra-commands you need to perform after installation. All those treatment are AJAX based, and your end-user will only see a progress bar, like any offline install.