There, you will also find a comprehensive list of search engines currently covered. Strictly by IP as this is the only really safe approach. E.g. the Googlebot spiders will cache your pages unless excluded from doing so by implementing a proprietary meta tag. This is hazardous to cloaked setups because the spider, if not uncommented and, hence, treated as a human visitor, will store the cloaked content which will then be displayed during search routines. Meaning that any competitor could catch you out cloaking, which is not what you would typically want.
Some clients prefer to edit the spider list manually.
Indeed, our fantomas shadowSniper program specifically offers this option. We are including Decloaking Hazards in the list in uncommented form in order to point these users to which spiders they should not include by mistake or for sheer lack of information. In a later version, we may split the list in two, placing these uncommented spiders in a separate exclusion list file. This is a trimming measure to reduce server load when in action as a cloaking engine list. Use the CSV version if you want full reference for each spider.