MDBG English to Chinese dictionary - English to Chinese dictionary with Mandarin pinyin - learn Chinese faster with MDBG!
wenlin - Wenlin Software for Learning Chinese
Pleco - The #1 Chinese dictionary app for iOS and Android
Youdao Dictionary - Youdao is a search engine released by Chinese internet leviathan, NetEase in 2007.
ChineseSkill - Chinese language has and does deserve its notoriety for heartbreaking difficulty.
DimSum - DimSum: a program designed to help you learn and use Chinese.