The number of Internet firms on NewMedia magazine's annual listing of 500 key interactive companies has grown from 15 last year to 47 this year, making it one of the fastest-growing categories on the list. In the Internet tools category, Netscape Communiciations is back, joined by newcomers Open Market, Excite, Lycos, and Progressive Networks. Others on the tools list include Yahoo, Infoseek, CyberCash , and Spyglass. Making NewMedia's list in the online/Internet category were America Online, Compuserve , Prodigy, Netcom Online Communications, Pathfinder, and Internet Shopping Network. The magazine's criteria for inclusion include revenue, profitability and technological leadership.