Algodoo

Find your documents folder. It's stupid, but Algodoo's scenes are saved to your documents folder, no matter where you installed it to. They said it was more professional, but it's really just inconvenient.

ok it works but i just see the default scenes. triroller and all that stuff. when i play i can load the scene whit the truck but i cant upload it! wtf

Hmmm..... That bites. It's going to be slightly inconvenient. The files are there, but hidden. There should be a button that says "show compatibility files" somewhere when you're looking at your files. Click it, and it will show the files you have created. Unfortunately, this button does not show up when you're browsing to upload, so you will have to copy/paste the file somewhere else (I suggest desktop) before you can upload it.
Whatever you do, don't move folders out of the area. Last time I tried it (moving the entirety of Phun to the desktop for convenience), all my files disappeared permanently with no warning. Move the files themselves instead of folders if you need to move things, but that's probably a bad idea to try with the way Algodoo is organized.