LimeSurvey
Run branching, multilingual surveys on your own PHP server under the GPL, or in the vendor's cloud, which is priced by the number of responses you collect.
// MYSQL
3 entries tagged with "mysql"
// ENTRIES
3 entries
Easy!Appointments
Online booking for a team that sells services, running on plain PHP and MySQL hosting. Google and CalDAV sync, but no automatic reminders and no payments.
Open Web Analytics
Click heatmaps and session recordings on your own server: open source PHP and MySQL web analytics, what it takes to run it, and how often it ships releases.