SAN FRANCISCO -- Silicon Valley may be best-known for its consumer technology companies. But software is definitely not just for consumers anymore.
The latest entrant: Slack, a flashy new service that makes it easier for co-workers to communicate and collaborate from Stewart Butterfield, founder of a startup in Vancouver, Canada, called Tiny Speck.
Companies selling software to businesses are in the midst of a renaissance here. Designers who grew up on the Web have touched off a wave of innovation, rejecting clunky software in favor of stylish, simple tools that mimic the familiar templates of Facebook and Google.
In Silicon Valley parlance, it's called the...