GUI for creating complex HTML tables

Question

Creating complex HTML tables manually can be cumbersome. Therefore I’m looking for a tool (with GUI *) that makes creating complex tables easy.

It should be possible to create any kind of table (e.g., with colspans/rowspans), not just the most basic/simple kind.

(* Note that I’m not looking for a different markup language which could be converted to HTML.)

Creating a table (GUI)

MUST:

• allow to specify which columns/rows are headers (Export: th)
• allow to specify which headers apply to which cells (Export: headers and/or scope attributes)
• allow to use HTML when entering content (i.e., the tool shouldn’t convert < to <)

SHOULD:

• allow moving columns/rows
• allow sorting columns/rows alphabetically

Exporting a table (HTML)

• Valid HTML5 snippet (table incl. descendants).
  • No need to validate HTML entered as part of the content.
• No ballast (no style attributes, no class attributes).

Formal requirements

• It must be FLOSS (can be a self-hosted Web app or a local client).
  • If it’s a local solution: I’d prefer GNU/Linux, but a solution for any OS is welcome.

Answer 1

There is a browser based HTML editor called TinyMCE which is able to edit tables:

http://www.tinymce.com/tryit/full.php

Just go to the table column and hit insert table. Then you can edit that table freely with the table tools. When you are done, just click Tools->Source Code and copy the HTML source code. Not exactly only for tables, but it works.

You can download your own copy and host it on your webpage if you want.

NOTE: It doesn't include all your sorting requirements and seems pretty basic...

EDIT: This one here satisfies all your requirements but is not a FOSS.