A free .pdf file download of a companion planting chart showing both beneficial and antagonistic companion planting combinations. The chart also recommends plantings that deter garden pests. http://garden.menoyot.com/assets/blogAssets/garden/companion_planting_chart.pdf Useful Lists and tips | Ecological Garden
Thanks @chelloveck , adding this one to the others I have. I like to cross reference different charts.
Here is another cheat sheet for gardeners. Everything you Need to Know About Vegetable Gardening in One Graphic - Complete Health and Happiness ** if you click directly on the picture it fully expands.