Math Practice

Multiflyer (multiplication game)
Multiplication Speed Grid
Multiples, Factors & Sequences (BBC)
Times Tables (in a minute)

Funbrain (math, English & more)
Arcademic Games (fun single/multiplayer games)
Calculation Nation (Challenge yourself and others)
Lure of the Labyrinth (pre-algebra role playing game)

Language Practice

FreeRice (Vocabulary Practice/Rice Donation)
Tools for Reading, Writing and Thinking
Comics! (Newspaper, Houston Chronicle)
Conjuguemos (Learn a Language)
BBC Skillswise Grammar
ToonDoo (Cartoon Creator)