The additional, annoying garbage which will be installed depends on where you get CD Ex from (e.g. filehippo, cdex.mu, download.cnet.com, major-geeks, free-codecs yadda yadda ad infinitum). Some places are significantly more annoying than others (steer well clear of cnet.com's downloads).
The installer from cdex.mu does come bundled with some of this crap (e.g. 'Search More Now', some horrible Yahoo desktop search bollox), but the installer does clearly indicate which extra packages it will install and you can decline all of them. Seems to be the case with most if not all free utility software downloads these days, unfortunately.