PCIbex is a free and open-source platform for designing, implementing and hosting online experiments, of use to anyone collecting behavioral experimental data in the cognitive sciences and beyond. Free experiment hosting is available on the PCIbex Farm, which comes with its own interface and requires no server setup, software installation or prior knowledge of a programming language.
Free hosting offered at https://expt.pcibex.net/ means posting simple experiments online just takes a few simple steps that can be shared through a URL. This is compatible with a variety of recruitment platforms, e.g., Sona, Prolific, or Mechanical Turk. Templates or prior experiments can easily be imported via github, which also allows for easy sharing of your work for maximal transparency and replicability.