Simple dropbox { index.php | password.php | upload_file.php | upload_inc.php | upload.php }
A really simple dropbox/upload script. All files are placed in a directory and the index.php file protects the files from being viewed and requires a password to proceed. You should rename upload.php so that you can't just jump to that file instead of index.php. The file upload_inc.php contains some config options (including a variable to change the name of upload.php). You also set the password and upload directory in this file so please edit it before anything else.
Simple dropbox contains only simple plain HTML so it should work on the most basic browsers, such as old phones and Lynx/Links and so on.

WebSMS { sms.html | sendsms.php }
WebSMS is a really simple way of sending SMS messages from a webpage using gsmsendsms. Originally I came up with this as a way of sending SMS alerts with Nagios (then using GET instead of POST).

WebWho { webwho.php }
WebWho is a simple PHP script to list users logged on to your remote Linux hosts. Note that you have to add ssh keys for this to work, and that the private key must by in the home directory of the Apache user (usually /var/www) and owned by the user under which Apache runs (usually www-data).