While there may be a profusion of apps and websites that are specifically designed for veterinary clinical settings, these few stand out.
A popular app that specifically deals with antimicrobials is the Target Antimicrobial Reference Guide to Effective Treatment. It is available for free download, compliments of Bayer Healthcare LLC, in the Apple and Android markets. The app ranks the efficacy of 24 antimicrobials against 13 of the most common pathogens and claims to select the most cost-effective antimicrobial and dosage for maximum efficacy.
Reviews of more veterinary apps and websites can be found here