frab is a free and open source web-based conference planning system. It helps to collect submissions, to manage talks and speakers and to create a schedule.
Con No integrations
In a time where every service has countless integrations with various other services, frab doesn't even notify admins of activities in the system; the only mails it sends are to speakers regarding the Call for Papers and proposal acceptance.
If you want to export to Lanyrd, have some kind of Slack/Messaging integration or what hove you, you'll not be satisfied (as of February 2017) - unless you submit patches, of course.