This is a list of the public plugins that I've created for CKEditor, you might find some of them interesting. I've added here a small description and in some cases a suggestion to use it or not, just to help yo understand faster what's the reasoning behind each one.
As you can see most of them are free, so if you want to support my work, you can buy any of the commercial ones and add a note in the payment so I can know that it's worth to keep publishing free stuff. Or at least say "Thanks" in this post or the pages at CKEditor, it's cheap and at least I'll know that someone has used successfully the plugins.
Some plugins are very simple and perform just a basic single operation, others are huge beasts that provides lots of functionality like the HTML buttons or SimpleUploads, take the time to read the linked page for each one.
check the Google Maps plugin for CKEditor, because it provides a simple interface to control many options of the Maps without any requirement to understand the underlaying behavior.
Uritec SL. It uses the SimpleUploads API to allow the users to perform basic editing (crop and resize to desired set of dimensions) of their pictures before they are uploaded to the server, or even to edit those images after they have been uploaded. For further details, check the ImageCrop page. This is a big productivity enhancer because it simplifies so much the process of cutting out the undesired parts of the pictures and then resize the selection to match the image sizes defined for the site, and it's God's sent gift for those users that barely understand how to use any image processing program.
Uritec SL.Whenever your users copy some content from MS Word (because it's an existing document, they prefer to create the content that way, etc...) the embedded images aren't copied along the content unless they use IE11. As not all the people enjoy being forced to use a browser, this plugin enhances the default Paste operation in CKEditor so it just ask the user for a couple of clicks to include the images into the content avoiding this way the frustration caused by the missing feature in Chrome and Firefox.
Uritec SL. Copying content from one site to another one means that the images use the references to your old server, but with this plugin all the images are copied and your content is updated to use the new URLs automatically. Now you don't depend on the other server, you can edit the images in your server, embed them in your emails, etc...
Uritec SL. With this plugin a floating toolbar will show whenever an image is selected, allowing the user to easily change the styles in anyway that you want, without cluttering the main toolbar or the restrictions imposed by the Styles dropdown.
With this plugin you'll have the ability to paste files into CKEditor, drop them from your computer, avoid uploads of files that have the wrong extension or are too large, use APIs different than the one suggested by CKEditor, you must read the SimpleUploads page and the linked posts to get a glimpse of all the things that are possible with this plugin and the API that it provides.