I was wondering, I would like to mod Morrowind, but the problem is that, I don't even know if Morrowind has a strong modding community, Any websites ?
Not sure what you are asking for?
If you are looking for community support in learning how to script, texture, build and improve on modding skills then the community is still going strong and has many very experienced modders willing to provide helpful advice - the Construction set forum doesn't move very fast so you won't necessarily get a reply in 5 minutes let alone in a day however in my experience when you do get a reply it is exactly what you need.
Outside of the official forums Fliggerty's is dedicated to modding and active, other forum's are Emma's, princess_stomper's and Canadian Ice's site all have minimal MW modding activity but some excellent older threads on modding that can be very useful to read - some modders keep their WIP threads running on these satellite sites - either they have advlt content not suitable for this forum, nostalgia or it's just easier to keep track of (not to mention forum reading legibility). There are other sites around such as Tamriel Rebuilt and the LGNPC team - the Tamriel site has an excellent name generator I use all the time.
However if you are asking about the Morrowind modding fan base and wanting to know if anyone will ever play your mods or whether you will get pages upon pages of congratulations on how wonderful your mod is then that's a different answer - gamers are still downloading mods all the time but as the game is no longer on the game store shelves the audience for Morrowind is diminished. Even the most popular recent mods are numbering in the 1000's of downloads not the 10's of thousands from MW's early days.
So - yes you can get good community support here and elsewhere but if you want to mod for fame you have a smaller pool of people to gain your modding fame or infamy in compared to other games being modded right now