A Highly Recommended Add-on, the WebHub Useful Source bundle includes:

All of ZaphodsMap, which is ordinarily free yet included for convenience
All of TPACK -- including utility code, special components and the main base classes used in the WebHub Components.
Source to the scrolling grids (TWebDataGrid, TWebDataScan, TWebScanList) plus the cloning utilties.
Source to the e-mail and telnet components (TWebMail, TWebMailForm, TWebSock, TWebTelnet)
Source to web-specific utilities (HtKeybrd, htStream, htStrWWW, htTagLst, HtmlEnc)

Note: Source to TWebDataSource is not included.