What are some alternatives?
When comparing Pmwiki and 42matters Explorer, you can also consider the following products
Gravatar - Gravatar (an abbreviation for globally recognized avatar) is a service for providing...
Piwigo - The default home page of a Piwigo photo gallery is the list of root albums. If it doesn't fit your need, you can create your own customized home page. There are 2 main methods: either you create an additional page or your create dynamic blocks.
ginstr Business Apps - ginstr is a business software that lets user create custom form-based apps for customers or employees to download, fill out, sign and return from any web device.
Skore - If Evernote and Pinterest had a baby
ThinkTank - ThinkTank is a cloud-based solution that enables game changing digital stakeholder engagement solutions for consulting & transformation teams to minimize project risk, while maximizing results.
MediaGoblin - MediaGoblin is a free software media publishing platform that anyone can run.