If you're looking for HIGH QUALITY Chinese-learning material, packaged in fun and practical videos, check out ABChinese on Youtube!
Learn how to say "You're Welcome" in THIS video: 
 

Hi guys, I just want to tell you about my project which makes learning Chinese characters much more fun!
You will find it here: https://www.instagram.com/chineseffect_daily/

I often have questions about French usage that can't be solved by a dictionary, so I have been relying on Linguee quite a lot.
For each word or phrase you can get a long list of real-world usages pulled from the Web.
It covers many languages, though I can only vouch for the French content as I haven't used it for any other languages so far.

Dear friends! 
We are glad to introduce our new app - ChineseYufa: sentence patterns. 
https://itunes.apple.com/app/chineseyufa/id1461752332
ChineseYufa: sentence patterns is a simple app for learning grammar of Chinese language! It will help you understand the core structure of most sentences. 
FEATURES:
Quotes of famous people
Two parts - Grammar and Reading
Dictionary and pinyin with one touch
Suitable for beginners and intermediate
No Internet connection needed
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Thank you for your attention! 

http://mawercer.de/spell is an early attempt to train spelling in various languages.
English, German, bengali, and many more coming soon -> write to support to have some added.
It remembers which words you got right doesn't ask multiple times about the same word.
You can use it from mobile phone.
Feedback welcome