Use The Index, Luke! : A tutorial covering SQL indexing and SQL tuning for developers: avoiding unnecessary details about database internals.
SQL indexing is the most effect...
MySQLTuner : MySQLTuner is a script written in Perl that will assist you with your MySQL configuration and make recommendations for increased performance and stabi...
Dolt : Dolt is a SQL database that you can fork, clone, branch, merge, push and pull just like a Git repository.
Connect to Dolt just like any MySQL database...
Vitess is a database clustering system for horizontal scaling of MySQL.
Minimize round-trip times : An article on the best practices to apply in order to minimize HTTP round-trip times
Let's make the web faster : There are many ways to make websites run faster. In this section, you can discover performance best practices that real web professionals employ in th...
Scrollback : Beautiful text chat for your community.
Scrollback hosts rooms that can be easily embedded on any website.
Sympl : Sympl is a collection of open-source scripts and templates which allow you to automatically and efficiently configure your website and email on a virt...
vicnum : A flexible web app showing vulnerabilities such as cross site scripting, sql injections, and session management issues. Helpful to IT auditors honing ...
Nice write-up on techniques for scaling up a web application.