Novomatic is a German company best known for producing slot games commonly found in land-based casinos around Europe (where they are often known as "Admiral") and in South America (where they are known more commonly as "Novostar").
The slot machines themselves often wear a 'Gaminator' badge (Super Gaminator, Multi Gaminator etc) and are generally multi-game machines featuring cult games like Book Of Ra and Dolphins Pearl.
The novel features in some of the 'Novoline' games have inspired slots from other developers, most notably Playtech and Viaden.
More recently, Novomatic have started to licence their games to a number of the online casinos (see casino comparison tool here) featured here and have even powered some dedicated Novomatic casinos which only carry Novomatic slot games. The number of online casinos featuring Novomatic games is still pretty small, especially when compared to those powered by dedicated online-games developers ().
This is partly because Novomatic's games licences are not cheap and party because many casinos don't regard their games as a priority.
Novomatic and it's game development subsiduary Greentube ares not known for card games or live dealer games so you will be best off liooking at the live casino list for other options.
That's not to say they don't try - but what they do best is slots!
Novomatic do restrict some countries from playing their games although the list is relatively small.
Each casino can pretty much decide who they take and who they don't so even German, Italian and French players can usualy find at least one Novomatic casino that will accept them.
UK players can choose any of those listed while US players - who probably don't know the games anyway to be fair - are restricted.
Right now, the number of online casinos that have Novomatic licences are few and far between, mainly because those that do have them have some limited exclusivity deals in place.
I would expect the list to grow though although on the bright side, the choice of land-based Gaminator games that are now available to play online is pretty decent, as are other land-based slots from the likes of IGT and Aristocrat. Finally, it is worth noting that very few mobile casinos feature Novomatic games at present although Novomatic's development company Greentube have released some of the more popular Novo slots available in HTML5 for tablets.