Adding specific search URL parameters can alter the results and give us a more customized search. Based on these parameters, Joost de Valk has a PDF cheat sheet file which includes links to the documentation for the values some of these parameters can hold.
Previously, Joost de Valk created a Depersonalized Search Browser Plug-in where users can search without logging out of Google and still receive depersonalized SERPs.
However, Joost might add more parameters like start=, channel=, ibd=, client= etc. Also upcoming might be an HTML Version of the cheat sheet file. We will be the first to report.