This is the most comprehensive Chinese-English dictionary for language learners, available for download on Android and iOS. It can be set to simplified or traditional characters, and it also includes an optional Cantonese dictionary.

A dictionary similar to Pleco that is available on web browser. Simplified and traditional characters

This is a both a dictionary and a learning resource for students at all levels. It includes free flashcards, HSK prep materials, reading materials and tools, and more. Most of the features are free, although it has ads and offers a paid subscription. Simplified and traditional characters.

Free online dictionary from China. It provides translation into English, example sentences, and similar words. Simplified characters.

free and open-source dictionary based in Taiwan. The dictionary provides definitions of words in Chinese with examples, also including translations into English, French, and German. It also has sections dedicated for Taiwanese Hokkien and Hakka, as well as sections for Chinese proverbs and idioms (成語、諺語、歇後語、etc). Traditional characters.

this is a website that gives you example sentences for any word or phrase, it's really helpful to understand the usage of new vocabulary. It also provides translation services for English and other languages. Simplified or traditional characters.

This website allows you to look up words to hear pronunciation from native speakers, which can be chosen based on region, dialect, and gender. It can be used for any language.

this is another dictionary that provides information about Chinese characters, including pronunciation in several languages (Mandarin, Cantonese, Japanese, Korean, Vietnamese, etc.), historical forms, related characters, and more. It's an interesting resource, but for the average Chinese learners it provides way too much information than what is needed.