The Raspberry Pi micro PC has been on the market for several years now, and is in its 4th generation.

A handful of companies have developed CMS software applications for the Pi - some I'd say more successfully than others.

One that's now been around for five-plus years, and built up both a mature platform and big user base, is PiSignage, an Indian company based in the tech mecca of Bangalore.

I spoke with founder Ravi Bail about why his software consulting firm got into the signage marketplace, and why it went with Raspberry Pi.

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We get into a lot of things, including how PiSignage makes money with a managed CMS that costs subscribers less than $3 a month.