Acapela is a good website for helping students with pronunciation.
ÀTantôt!- a subscription site for resources in French, German, Spanish, Italian and Chinese. Esther Mercier also shares lots of fantastic ideas freely via social media.
Français Extra is a website for beginner, intermediate and advanced learners of French.
Frenchteacher is a site by former head of MFL, Steve Smith. Lots of resources (including lots of freebies!) and more links here. Also check out his Twitter and his fantastic blog.
Sporcle generates quizzes which you can share with students.
Staffroom Swop Shop is a blog by Rebecca Wylie where she shares lots of fantastic ideas. Also check out her incredible student blog on Weebly and her Twitter.