In addition to ObjectDock, logonstudio, bootskins and cursorxp are free. (There's a payware version of cursorxp that has more options). WindowBlinds is shareware but the free version lacks the full functionality of the enhanced registered WindowBlinds. I haven't tried the shareware versions of other Object Desktop apps so don't know what their limitations are, either timewise and/or in functionality.
Sysmetrix (not a Stardock app) is still freeware I believe. Rainlendar (calendar app) that you see in some screenshots is also free and not a Stardock app. There's no rainlendar library for skins here but other skinning sites like Deviant Art have them and probably a link to the app also. (Or google for rainlendar.)
Best thing to do is go to the various libraries and read up on the info available for the apps to see what's what.