Actively maintained

Summary

This module uses Entity Referenence relationships and Date fields to flag entities as "unavailable" during specific time periods.

Documentation is available here: http://www.westernascentinc.com/open-source-projects/entity-availability

Flexibility for complex relationships

The idea is to allow an admin to create rules like this:
Date Field A.date-A of Entity A defines a period of time when Entity B is not available.
Entity A connects to Entity B with Entity Reference Field A.reference-B
When Entity C then tries to reference Entity B with an Entity Reference Field C.reference-B and defines a date range with Date Field C.date-A that is set within the time range defined by Date Field A.date-A, a validation error is thrown on save of Entity C, because Entity A has "reserved" or made Entity B unavailable in that time range.

The relationships are all configurable. Entity A and B could potentially be the same entity. The field relationships are all configurable as well, and a ctools multistep form wizard exists to help you get these complex rules set up.

The Mozilla Open Badges module hooks into the User Badges module to allow
badges created by that module to be connected with the Mozilla Open Badges

Simple baseline entity box that provides a FlexSlider-powered rotator.

This module allows for the creation of different types of users, each with their
own independent fields, form, and display settings.

Adds a "Google Analytics alike" date range picker integration as a module.

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Documentation

Overview & Documentation