PC-based keyboard layouts for Mac OSX with some customizations. Thanks to [Ukulele]http://scripts.sil.org/ukelele.

Copy to your ~/Library/Keyboard Layouts folder, and then activate them via System Preferences - Keyboard - Keyboard (tab) - Input Sources.

For less talk, just install, and fire up Keyboard Viewer from the menu bar (need to activate the viewer first it in System Preferences - Keyboard - Keyboard (tab) - Show Keyboard & Character viewers...).

For a longer read, go to http://wiki.andreineculau.com/Custom_Keyboard_Layouts_with_Romanian_Diacritics (albeit that page has information about the outdated sibling keyboard layouts for PC).