This is an excellent tool for Magento developers.

Magento Quick Reference:
>>A handy tool for Magento API Quick Reference
>>Consist of two drums - left and right
>>Left drum we may find main contents and right subcontents
>>A text area is provided below to show the selected content's details.

Magento Quick Reference covers the following area:
>>Category API (11 entries)
>>Category attributes API (3 entries)
>>Country API (1 entries)
>>Customer Address API (5 entries)
>>Customer API (5 entries)
>>Customer's Groups API (1 entries)
>>Inventory API (2 entries)
>>Invoice API (7 entries)
>>Order API (6 entries)
>>Product API (8 entries)
>>Product attribute sets API (1 entries)
>>Product attributes API (3 entries)
>>Product Images API (7 entries)
>>Product links API (6 entries)
>>Product Tier Price API (2 entries)
>>Product types API (1 entries)
>>Region API (2 entries)
>>Shipment API (7 entries)