Quality control is a crux of crowdsourcing. While most means for quality control are organizational and imply worker selection, golden tasks, and post-acceptance, computational quality control techniques allow parameterizing the whole crowdsourcing process of workers, tasks, and labels, inferring and revealing relationships between them. In this paper, we demonstrate Crowd-Kit, a general-purpose crowdsourcing computational quality control toolkit. It provides efficient implementations in Python of computational quality control algorithms for crowdsourcing, including uncertainty measures and crowd consensus methods. We focus on aggregation methods for all the major annotation tasks, from the categorical annotation in which latent label assumption is met to more complex tasks like image and sequence aggregation. We perform an extensive evaluation of our toolkit on several datasets of different nature, enabling benchmarking computational quality control methods in a uniform, systematic, and reproducible way using the same codebase. We release our code and data under an open-source license at https://github.com/Toloka/crowd-kit.