Not even a cent! It is completely free. However, the more favorable mod pack for servers is now "Feed The Beast"
Chat with our AI personalities
Tekkit itself is completely free and requires no registration however you are required to have a premium Minecraft account to use the official Technic launcher regardless of whether the server is "Online" or not.
Tekkit is mostly a modded version of mincraft but tekkits better
yes
java 6
It does cost money. but you can download it illegally