This is one of my favourite resources online. It has different sections relevant to Language Arts teachers including the following :
A- Language and Literature Subject Centre
It provides free reading, language arts, and literature teaching materials.
B- Language Arts Worksheet Library
It provides a variety of language arts lessons and worksheets for teachers to select from.
C- The Reading Machine
It provides links to 36 online games to help your students practice and enhance their skills.
D- Writing Bugs
This is a library of writing bug printables full of lesson ideas
E- Fun Grammar Activities
This one provides games, activities,and lesson plans on how to better teach grammar
F- Vocabulous
Use Vocabulous to challenge your middle-grades and high-school students to build a fabulous vocabulary.
2- Lesson Plans Pages
As its name suggests, this section provides some great resources on laguage art lesson planning. It has also links, activities, games and many more.
3- Web English Teacher
4- Creative Writing
This is another section from Web English Teacher. It provides links to websites that promote creative writings. The links work perfectly and they lead to some awesome websites.
5- National Council of Teachers of English
This is a must stop by website. Teachers of English from all around the globe use it to connect to each other and share resources and materials.
6- Learner.org
7- Sheppard Software
Sheppard Software's Language Arts features a variety of games for different grade levels ( Elementary , middle schools, and high school ).
8- National Writing Project
The National Writing Project's 30 Ideas for Teaching Writing offers successful strategies contributed by experienced Writing Project teachers.
9- Daily Grammar
10- ABC'S of The Writing Process
The purpose of this site is to provide a user friendly online resource, for students and teachers, no matter what they are being challenged to write.
11- Read Write Think
This is another great website for Language Arts teachers . It provides teaching materials for different grades and on a variety of topics.
12- Teaching Today