i-Biology.net hosts resources, presentations and ideas for the whole IB Biology course. Over 2 million visitors have used the site. It is free to use, and Creative Commons. 

Donors who the give the value of a study guide (£20) or more will be able to join a shared folder with editable powerpoints. 

100% of all donations goes to charity. 

Thank-you! 

Stephen (@IBiologyStephen)

Note: The £99.00 recorded as 'offline donations' refers to donations made by i-Biology.net donors through the old gifts4good.co.uk service, which has now closed down. I include the value here to keep a running total.