📚 Dictionaries

Esperanto-English

Tuja Vortaro is an instant dictionary, good for quick lookups.

Reta Vortaro is one of the most popular multilingual Esperanto dictionaries. The mobile apps PReVo, Praktika Vortaro, and Poŝa Reta Vortaro are based on it.

Wiktionary is a collaborative dictionary from the makers of Wikipedia. It has English definitions for many Esperanto words.

Esperanto-Esperanto

PIV (Plena Ilustrita Vortaro or Complete Illustrated Dictionary) is the most comprehensive and authoritative Esperanto-only dictionary.

Vikivortaro is the Esperanto-only counterpart to Wiktionary.

Computer terminology

Komputeko is a dictionary of computer terms, very handy if you're writing software or contributing a translation for a project. Also available in PDF.