Open Source software is great, so I chose to participate in some projects myself. On the following pages, you find more information about the projects that I support and have participated in.
In my opinion, the Tanuki Java Service Wrapper is the best Java wrapper out there. Sadly, they do not provide the binary files for their Java Service Wrapper for Windows x64. But since the wrapper is released under the GPL, the source files are available, so I chose to regularly compile the wrapper binaries myself and provide them on my website.
I am the author of the MySQL 8 Recipes video course by Packt Publishing. This video course contains simple recipes to work with the latest version of the MySQL database. The course is geared towards database administrators and programmers that want to work with MySQL 8.
OLTPBench is an extensible "batteries included" DBMS benchmarking testbed that is tailored for on-line transaction processing (OLTP) and Web-oriented workloads. I contributed multiple Oracle database related bugfixes and updates.
Cluster SQL*Plus is a BASH script to query multiple Oracle databases in large environments. It functions as a wrapper for Oracle SQL*Plus to make working with multiple databases easier. It allows you to manage large environments and can be used to generate reports, automate queries over many databases or just to screw around on multiple databases at once.
For my studies in Computer Science, I like to keep my scripts and code in a repository. Since my notes and my code could also be of help for other students, I chose to make them publicly available on GitHub. Here some of the lectures (German):