Actively maintained

Get Post is a utility for detecting excessively long GET urls when forms are submitted (ones which would exceed limits in MSIE), POSTing the data and retrieving it on the subsequent page.

Entity Registration is a flexible module for allowing and tracking user registrations for events, or just about anything you want people to sign up for. Entity Registration can be integrated with Drupal Commerce to allow fee-based registrations: sell tickets to your stuff! This module is also handy if you want to collect information along with registrations: like shoe-size for a bowling event.

Creates an appcache manifest

This module provides a unified node_access like api for all kind of entities.

If you know similar projects, please post them

This module adds a block that allows you to display the git clone url (as text) and a link to an online git viewer.

Provides some tweaks to how CiviCRM groups are listed in forms to make managing large number of groups a bit easier.

This module does not do anything to actually alter user access to groups. Every user with permissions to access a CiviCRM group because of either Drupal permissions or CiviCRM ACLs will still be able to with this module. All that this module does is change which groups are available when the user is asked to select a group from a form element (e.g. while searching for contacts or adding contacts to groups).

This module provides the following functionality:
Display Group Nesting in Select Boxes
When groups are nested in CiviCRM, they are still displayed as a flat list when rendered into an HTML Select box. This module allows child groups to be displayed indented under their parent group.

Groups are 'Owned' by a user
Groups have a single user who is treated as the "owner" of that group. Groups can be marked as shared to the owner only, so only the user that owns the group sees this group when selecting groups. Currently, groups are owned by whomever creates them, and admins can transfer group ownership to themselves.

Groups can be tagged with user custom data