I would like to suggest the damage calc here
for addition. The fact that it uses base stats for easy memorisation along with being able to cope with just about every possible battle situation and having extra features (variable base power move calculator, chance of KO), relatively small screen size, and general ease of use make it a great alternative to those listed.
For people who like storing things: The Box
Reading and LC? LCF
, LC Guide
, LC Analyses
Good channels: #littlecup, #C&C, #1v1, others
And for SCMS editors: SCMS group
ete on IRC. Goodbye Smogon. Good luck, was fun while it lasted.