The first new release of 2015 is my Wordpress plugin, Smart App Banner.
Version 1.1.0, rather than insisting that you remember (or copy and paste) the app IDs, remembers them for you and gives you a dropdown list when you add a new post:
Once selected, the details are filled in. You can then customise them before saving.
You can define the list of apps in the Settings menu. Editing entries here does not affect any of your existing posts, so don’t worry about experimenting and “breaking” something.
One question you may have: why doesn’t it keep a central list of apps, allowing you to update them all in one place if you want? Unfortunately there are too many edge cases, making it difficult to code and awkward to define sensible defaults or Undo mechanisms. For example, what happens if you delete an app? How would you deal with the affiliate data and app argument? (Those last two fields probably vary from page to page anyway.)
It’s a small thing (that due to the “wonders” of PHP took longer than I’d have hoped to implement) but very useful I think. I hope you like it.