Purdue University's OWL (Online Writing Lab) contains relevant information for students pertaining to academic writing. This part of the site (Research and Citation) specifically outlines different formats for citing and referencing (such as APA and MLA).
Padlet is tool for asynchronous (or synchronous) posting of comments and images on a wall by multiple users.
This tool is much like a discussion board, but it's a bit more visually stimulating and motivating for students, as they get to choose where on the wall they will leave their note (kind of like a sticky note on a bulletin board). This also works great for department-wide discussions. Users do not need a login to post.
Blogger is a free site for blogging. It is incorporated with Google, so if the user has a Google account, he automatically has a Blogger account.
This site (as well as any simple blogging site) can be used for students to publish their writing and receive a world-wide audience. Additionally, students can keep a reflection journal of their own progress, feelings, and questions regarding their learning. Finally, instructors can use blogs to communicate important information to their students as well as share their voice in an easily-accessed, asynchronous means.
I am a fully online French instructor and the lead instructor for our world languages department at Michigan Virtual University, an online provider for Michigan's middle and high school students.