Text-Slider within Matrix field in my Sections (Single, Channel and Structure) I am using one matrix field containing typical content elements, Text (One Column), Text (Two Columns), Image, Text-Slider, Image-Slider and so on...

My problem is the Text-Slider with Richtext and links in it. Unfortunately Matrix field doesn't offer any Repeater or Nested Matrix functionality so I don't know how to build the structure for this element.

My Image-Slider is a no brainer , I take an asset field and with every image there is another Richtext field I can use.

The Table field has no Richtext field in it... 
There are a lot of small Text-Sliders all over the website.
Any Ideas? Thanks much!
You could use your default "Text" Matrix block type for the sliders and have an extra block type as a "Slide Wrapper", to wrap "Text" (and "Image") blocks which should go into your slider.

See this question for an alternative approach, to recognize succeeding blocks of the same type automatically in the template Solution for Matrix-within-Matrix (or More Robust Table Fields).