DFTools 3.0 provides 30 visual and nonvisual components for Delphi4, including all source code upon registration for only 20 Euros. Description available only in German with various demonstration programs available on the website.
Unfortunately, the product description is only available in German at the moment. However, the website has plenty of demonstration programs for you to try out, making it easy for you to see the software in action.
Pricing-wise, DFTools 3.0 is a steal, with a mere 20 Euro required to purchase it. With such an affordable price tag and the added bonus of full access to the software's source code, DFTools 3.0 for Delphi4 should be a no-brainer for anyone looking to enhance their Delphi4 experience.
Version 3.0: N/A