Mint seems to work. My upper balcony always had lots if spiders, so many that it freaked me out in the dark (serious arachnophobe too). This year I grew pots of mint for my summer mojitos, and as a side effect I have not seen a single spider on that deck this year. Next year, I plan on growing more all around the house.
Mojitos parties are planned for every week-end
I also hear that if your put white vinegar in a spray bottle and spray your foundation every week or two that you can repel them that way.