Conjugato

A flashcard application for practicing Spanish conjugations.

Babbel

Teaches languages through translation and listening exercises. Also features live lessons with instructors.

Pimsleur

Teaches languages through various methods including audio courses, flash cards, and pronunciation practice.

Duolingo

Gamifies language practice, mainly through translation and listening exercises.

Mondly

Gamifies language practice, mainly through translation and listening exercises.

Modern Spanish Grammar: A Practical Guide textbook grammar

Juan Kattan-Ibarra and Christopher Pountain
A comprehensive guide to Spanish grammar with a focus on word forms in the first third and teaching through examples in the rest of the book.

A New Reference Grammar of Modern Spanish textbook grammar

John Butt, Carmen Benjamin and Antonia Moreira Rodríguez
A guide to grammatical forms of Spanish. Contains notes for Spanish usage both in Europe and in the Americas.

A Reference Grammar of Spanish textbook grammar

R. E. Batchelor and Miguel Ángel San José

The Sounds of Spanish textbook phonology linguistics

José Ignacio Hualde
A comprehensive guide to the phonology and phonetics of Spanish, providing an introduction to these fields of study.

Using Spanish: A Guide to Contemporary Usage textbook

R. E. Batchelor and C. J. Pountain
A supplementary guide to grammar and vocabulary for people who already know some Spanish.