As we're building our own systems or find handy stuff, we collect it and have it there for later reference. We're now feeling others may need this as well.
Feel free to use these freebies however you wish. Just as we have found snippets or modules created by others very useful, we hope these do the same to you when building your next Drupal system.
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The Drupal Node Reference URL Widget module helped us create references between nodes, but we had a use case that required preventing the creation of multiple pieces of reference content...this is where the Single Node Reference module came from.
It has a small admin section allowing you to choose which Node Reference fields you want to "lock down" to a single referenced piece of content. Very handy when the need arises :)
Extending the Node Clone module (contributed on Drupal.org), this module allows the cloning of all referenced nodes found attached to the cloned piece of content.
An admin interface allows for you to choose even more bits and pieces - during the cloning process, you can have a referenced piece of content converted into another content type. Handy stuff for manipulating content types. Now free for you to use however you wish!
A simple module which bridges between both the infamous Userpoints module and Auto Expire. What it does is allows an administrator to set an amount of points to deduct from a user when they try to extend a specific node type.
All node types found within the Drupal system are able to be deducted against - this has been used in our HiredGuns system with great flexibility.