My competitive programming library, accumulated over several years.
The library is explicitly not very comprehensive and only includes things that I've basically learned to type by memory. Implementations are intended to be high-performance, as well as concise and generic whenever possible.
Most implementations are verified automatically against online ojs with the oj-verify tool.
Most of this you would find in other libraries, however one highlight is the stresstest python script, which automatically stresstests programs in parallel for maximum performance. Usually you can get around an 4x speedup (at least on my laptop) which is quite useful in competitions.
Also includes some of my personal dotfiles etc.