It's probably safe to say that martial arts in general are an extremely popular form of discipline and dedication to a cause (spiritual, physical, or both) across the world. It is interesting to think that millions of people around the world practise their various disciplines and are doing so at this very moment, whether these be Judo, Aikido, Jujitsu, MMA, freestyle, boxing, kickboxing, or karate; it can be even more interesting to look at the various forms of a certain martial art, however. MMA is a fairly obvious example since it incorporates a multitude of styles, the number of which that can be used is only restricted to the preference/s of the fighter him/herself. Shotokan karate has to be one of the most impressive branches of a wider discipline however, with its unique striking style requiring speed and power. This isn't an exercise in the history or nature of Shotokan itself though (for this, see the Brief History of Shotokan page); this is a look at the spread of the discipline throughout the world that is manifested through the existence of national/international Shotokan karate groups that exist on the internet. This is a brief look at just some of those groups.
Japan Karate Association (JKA)
Arguably the original organisation of karate, the JKA was actually formed by some of the senior students of Gichin Funakoshi. From this organisation, it can be said that the rest of the organisations below then followed in one way or another; they are the descendants of the JKA whose English website can be viewed at your convenience.
Japan Karate Shotorenmei (JKS)
The Japan Karate Shotorenmei's website is pretty barebones and the English translation isn't the best, but the organisation lays out their aims and provides plenty of information about various events that take place throughout the year. Their headquarters resides in Japan where the organisation promotes traditional values and advocates the adherence to traditional Shotokan karate practises. View the translated JKS website.
Japan Shotokan Karate Association (JSKA)
The official website of the Japan Shotokan Karate Association lays out all of the things you could ever wish to know about the organisation itself. It also houses information about senior instructors/practitioners of the martial art as well as various other features like a photo gallery, shop, and information about events.
International Traditional Karate Federation (ITKF)
This organisation's website is better designed than most of the ones on this list making it a pleasure to navigate, aiding the discovery of amazing facts and the assimilation of knowledge about Shotokan karate for anyone wishing to learn.
Shotokan Karate-Do International Federation (SKIF)
You can keep fully up to date with the happenings surrounding the SKIF on their website, another one of the more well-designed fronts of an organisation's presence on the web.
International Shotokan Karate Federation (ISKF)
You'll find the headquarters of this organisation in Philadelphia, Pennsylvania but information about their organisation, events details, instructor bios, and much more can be found on the ISKF website.
Karatenomichi World Federation (KWF)
Exam details are available on the KWF website as well as their philosophy, news, and various videos of various kata and karate practitioners in action.
International Karate Daigaku (IKD)
The IKD webpage is kept up to date with their various events and offers many pictures/details about their various events, Dojos, and Lineage.
World JKA Karate Association (WJKA)
This is a fairly basic site but it has enough content to browse through and learn a little more about the organisation, its staff, and the legacy of the association. Visit the WJKA website here.
Indian Federation Of Shotokan Karate (IFSK)
If any further proof of the growth of Shotokan karate is needed, it should stop at the IFSK. Its website details various Shotokan events in India and provides background information on Shotokan karate itself.
World Shotokan Karate-Do Federation (WSKF)
You will find an interesting history of the WSKF on their website as well as a declaration of intentions and philosophy, activities, and a range of articles on various relevant subjects.