There are a tremendous number of techniques for bowing string instruments. This article lists and describes the main types of bowing. Demonstrations and discussions of many different techniques can be found in the video and audio clips in the articles below.
In these clips Corin Long explains and demonstrates selected aspects of double bass bowing. This films contains information about the bow in general, literally 'measured' notes: an "in the string" sound, performed either in a single bow or in alternate bows, Martelé: "hammered" notes - this is really an extension of staccato playing, producing a very heavy sound on the bass and more...