Greatis Image Editor is a pure VCL/WinAPI solution, so no external DLLs are required. Image Editor Suite contains 5 components:
1. TImageEditor - visual component that displays, zooms and scrolls image. It receives all user input and translates it into drawers' methods calls.
2. TColorToolbar - visual component that can be connected with TImageEditor to choose foreground and background color. Color palette presented as collection property that can be edited at desing time and at runtime, saved to file and loaded from file. There are methods which can add standard color sets, like VGA palette, gray scales, etc.
3. TSimpleDrawer - non-visual drawer component. Has no own functionality and just fires event from each method. Use it for creating simple drawing functionality. It is used as ancestor for any drawer components also.
4. TStandardDrawer - full-functional drawer component. Supports all you need in graphic editor - dropper, eraser, pencil, polyline, brush, spray, fill, empty and filled shapes, text and, of course, selection and clip operations. It can be used as good example of creating drawer components.
5. TPluginDrawer - drawer component that allows to use drawing functionality realized in the external DLL. Plugin DLL can be connected at design time and at runtime with easy. DLL template included into Image Editor Suite.

The license of this software is Free Trial Software, the price is $140.00, you can free download and get a free trial.