Apps

Software applications for laptops or mobile devices
Be sure to read the customer reviews and test mobile apps before any upgrade or app purchases.

Navajo Language Renaissance
Purchase Navajo Rosetta Stone software, sign-up for Navajo Language Assessment Exam.

Duolingo Navajo Course
Beginner Navajo course. List of all the vocabulary utilized is here, and another user provides a detailed explanation here in the forum.

Navajo Word Processor Software

Eurotalk Navajo Computer Program-Free Preview
Navajo program in various forms available for purchase online.

EuroTalk Interactive – Talk Now!  by Topics Entertainment

uTalk HD Navajo iPhone/iPod Touch App – by EuroTalk
Lots of basic vocabulary with fluent speaker audio and quizzes to test knowledge.

KTNN 660 AM iPhone/iPod Touch App by KTNN Radio Station

Speak Navajo App by Speak Navajo Google Play and Apple Store

Diné Bizzad App by Navajo Innovation Inc.
IOS app, searchable dictionary. Audio only available through upgrade.

Navajo Toddler App by TinkrLabs  WARNING! Pictures do not match the word. 
The quiz and English/Navajo word pair at the bottom and audio seem to be correct. 
Small set of terms for numbers, clothes, food, colors, etc. Quiz and mini song section.