managed links in Wysiwyg? I am looking for a systematic way to deal with links in Drupal, like there is for images.
For images, you add image field to content type, then install "Insert" module and you can use Wysiwyg to easily insert the image anywhere inside the node content and still have it "manageable" because it is a field. 

I am looking for something similar for links (external and internal), but can't think of any existing method. What I have found is to either use "Links" module and have all links displayed at the bottom of the node (via a field) or use Wysiwyg "Link" button and insert links anywhere, but they are unmanaged.

I am looking for a solution where:


All links would be more easily managed - because
they would be kept as fields (most probably "Link" field)
It would be possible to have those links displayed not as a link
list at the bottom of the node, but rather in various places inside node content (like
images with "Insert" module).
I would recommend that you base your solution on the ckeditor_link module. To use this module, you will of course need to be using ckeditor for your wysiwyg editing.  If this is not a problem, then users will be able to use a new "Internal Link" URL type when creating links.  Typing in the node title of the target will make a link to node/1234, and this link will be transformed into a link to the node's path alias at render time.  Now, your internal links will automatically change if you edit the path alias of the node; there is nothing else you need to do to manage them.

For external links, I would make a new node type for external links, and make a landing page for each one.  Use a link field on the landing page to hold the external link, and put boilderplate text in your template for that content type.  Once you've set this up, you can again use the ckeditor_link module to target your landing page.  If you don't like the idea of a landing page and you're a little handy with coding, you could make your own version of ckeditor_link for external links, and modify its input filter to render the URL of the target link instead of the URL of the landing page.