Pleco - The #1 Chinese dictionary app for iOS and Android
wenlin - Wenlin Software for Learning Chinese
Youdao Dictionary - Youdao is a search engine released by Chinese internet leviathan, NetEase in 2007.
DimSum - DimSum: a program designed to help you learn and use Chinese.
Syng - Syng is a free, open source, cross platform, Chinese to English dictionary app and study toolset.
ChineseSkill - Chinese language has and does deserve its notoriety for heartbreaking difficulty.