Todd Ditchendorf
Fluid
Trial versionTransfer web apps to the OS X desktop.
MacCanvasUML
FreeUML diagramming tool
MacExedore
Trial versionMac-native, single-window Python IDE.
MacXMLMate
FreeTextMate XML/XHTML validator plug-in
MacMocks
PaidCreate high-fidelity mockups of iOS, iPad and iPhone applications.
MacFake
Trial versionAutomate web browser actions, run tests on your own website.
MacHTTP Client
PaidDebug HTTP services by graphically creating and inspecting complex HTTP messages.
MacShapes
Trial versionCreate elegant diagrams.
MacCocoa Cookies
Freemanage cookies in Safari, NetNewsWire, Shiira
MacGooeySAX
Freevalidate & check XML documents
WindowsXSLPalette
FreeXSLT 2.0/XQuery 1.0 palette for BBEdit/TextMate
MacSOAP Client
Freedebug soap & wsdl-based web services
MacAquaQuery
FreeXQuery editor/debugger
MacXML-RPC Client
FreeXML-RPC graphical debugger
Mac