I have to say that my favorite is the Travelmate Mobile Fireplace [without a flue] which basically means you can take it anywhere: from outside to the dining room to the living room to the bedroom ... no matter what your evening plans are, or where you end up ... the simple charm of having a portable smoke-free fireplace is that it can follow you anywhere you go!
The first five images are chimney-less fireplaces from CONMOTO.
The two image just above are Conmoto's Balance Modular Stove System. These wood-burning units need a flue unlike the other three on the very top - which are smoke-free because they burn bio-alcohol.
The first five images shown above are eco-friendly units because they run on bio-alcohol, ethanol or wood-burning alcohol; and the best part is they don't require any ventilation systems.
More at http://www.conmoto.com/
Another place to look for eco-friendly fireplaces is EcoSmart which I got to discover up close at the AltBuild Expo in Santa Monica, California. Another very cool thing about these ethanol fireplaces, is that they can actually heat a room up to 400 sq ft [depending on the model] - but you can also use inserts for existing fireplaces and/or other units such as the wood boxes shown above ... and there are a slew of other very cool models for different uses.
If you like the concept of wood/smoke-free fireplaces, also check out the line by Sparkfires: unfortunatly, having seen the models up-close Expo their website doesn't do justice to the actual units, which look very nice.
More at http://www.sparkfires.com/
Another source of stunning fireplaces is Stuv. Their models are simple and beautiful [and very pricey] but their units are for wood burning unless you chage them with an insert by Sparkfires or Conmoto.
More at http://www.stuvamerica.com/en/index.php
And of course, you already know about Rais fireplaces [below is the basis X model] but check out their site for more designs. These are wood-burning unless you convert them to denatured alcohol units.
More at http://www.rais.dk/