There are many ways for anyone to help develop Project WOnder. It would be helpful to become familiar with the information in Creating and Submitting an Acceptable Patch. For more minute detail, you can keep up with the committers's progress moment by moment by subscribing to the Commit History RSS feed on GitHub.
Project WOnder is a large set of frameworks and example applications and utility applications. Project WOnder can be used with different versions of WebObjects. (What versions of WOnder are compatible with what versions of WebObjects?) Developers may be using different tool sets to edit their projects, including eclipse and Xcode. Contributors should keep all of this in mind as they make changes.
Please see this tutorial on importing the Project Wonder sources into your eclipse environment.
There are dependencies between the frameworks that make up Project WOnder that must be kept in mind while changes are being made.
Since the move of Project Wonder to GitHub, the main branch ("master") is for WebObjects 5.4. If you use WebObjects 5.3, you have to use the Wonder_5_0_0_Legacy branch.
Project WOnder uses different name prefixes for different parts of the system. Prefixes include those in the list below. Note that there may be components and classes in very different parts of the system which do similar things. Code and resources are not necessarily organized by functionality, but may be organized by time of creation, by author, or by some other factor.
It is not always easy to find things. Ask the mailing list if you have questions.