Add Content Between the_content and plugins

I’m trying to add a get_post_meta that I added between my the_content and some plugins I’ve added. The plugins automatically go after the post, but I can’t figure out how to make the plugins display after my new get_post_meta content that I added instead of after the_content from the single.php or the plugin files themselves.

See screenshot below for more specifically what I want to do:
http://imageshack.us/f/442/contentplacement.jpg/

Any help would be much appreciated! Thanks!