I need some editor tools for any markup language that could provide simple table generation and text editing for my users. Something like stackoverflows markdown editor, but with table generation support. What kind of markup language and editor can I use?
You might be interested in WYSIWYG text editor called CKEditor. It is api for web, you can embed it into your web application using just html + javascript. It support most of major browsers, and is hightly customizable. It generates pure html on the end. And has wide range of tools, especially the one you are looking for: table.
Check out the demo: http://ckeditor.com/demo
I personally like TinyMCE, but I might be biased since it's the default editor for all the projects I do at my day-job :) You can check it out here: http://www.tinymce.com/tryit/full.php but be aware, the one in the demo is set up with overkill many features enabled. It's highly customizable, so you can make it do just what you want, and pretty easily too.