Loquella has a reputable language learning series available for iOS devices and the third installment, Learn Spanish by Loquella tackles the most popular foreign language in the US.
iPhone and iPad apps tagged "language guide."
Language Series for iOS Continues with Learn French by Loquella
With the release of Learn French by Loquella, the series of language learning apps for iOS has grown to include a total of three language options. Like with their other apps, Loquella takes a methodical approach to language learning and introduces users to pronunciation, grammar and dialogue while helping learners to grasp meaning.
Learn Chinese by Loquella - Language Lessons for the Serious Learner
Learn Chinese by Loquella is a language education app that provides instruction in Mandarin Chinese and uses repetition to master pronunciation.
iSign Lite: An Introduction to American Sign Language
Created by Aaron Basil of iDev2 (makers of ABC Letters, ABC Sign, ABC Words, Animal Farm, Sound Box, and Tell Time), iSign Lite is a free, introductory version of the larger iSign. Direct descendants of ABC Sign, an application that teaches the American Sign Language (ASL) alphabet to children, iSign and iSign Lite take a step further using 3D animated characters to demonstrate a full range of ASL signs.