Editr: Slideshow

I haven't developed a custom module, because it's really easy to make a slideshow. Basically what you need to do is, to go to your module manager in joomla administration, click the new button and choose custom html option.

Give your slideshow a name, but disable showing it. Select "slideshow" as it's position. Now just add how many  images you want via wysiwyg editor (they should be all in the same size)  and give the first image class "active"

Example

<img src="/templates/editr/images/slideshow/1.jpg" alt="Editr" class="active" />