Leverage Software (San Francisco, CA) – With their Online Community Platform, Leverage Software claims to private-label their solution and more than 250 companies in the technology, media, consumer and services industries.
It’s a 100% on-demand solution so no infrastructure and development, but there’s obviously less control. But, they do offer open and extensible APIs so you can customize the community as well as integrate it into your existing site and there are RSS feeds and even a pretty cool widget toolkit which handles blogs and discussion groups.
By far, the coolest feature of Leverage Software’s solution is the PeopleMap – sort of like a community groups vs. google map mash-up. There’s a easy, visual way to show on a pie scatter gram and locate who’s “closest” to you based on interests, area of experience, and profile attributes you can define. I see tremendous application for this feature in the communities I've designed. There’s also a QuickConnect Card which helps build the community by embedding links into the users' emails.
In terms of pricing, you’re probably looking at a $10k setup fee and anywhere from $15k (1,000) to $150k (100,000) per year based on the number of active community members. It’s worth noting that Leverage offers CommunityConnect for Force.com AppExchange so you can build a community from your existing SalesForce customer database!