The Simple Custom Content Adder (SCCA) does exactly what it says on the tin – adds some custom content to all of your posts and pages, simply.
Perhaps you have a promotion you want to add above all your posts, or you wish to add a disclaimer to the bottom? SCCA can cater for both (although not at the same time just yet!).
SCCA utilises features that, as a WordPress user, you will be familiar with. A self-explanatory administration screen will have you showing your Custom Content on your posts and pages in no time!