https://itunes.apple.com/us/app/plant-o-matic/id906932765?mt=8
Plants for the people . . . a free mobile phone app for iPhone and in the future Android powered by BIEN. Plant-O-Matic uses the GPS of the users phone to  generate a personalized species list of all plant species that are found nearby. The app accesses the ~ 100,000 plant ranges in the New World to allow the user to explore the taxonomic, functional diversity around them. It provides links to images and additional information regarding each species.

https://play.google.com/store/apps/details?id=com.toscanyacademy.completebiology
Complete biology app is among the best biology app in the market. It focuses on secondary / high school students, undergraduate students and biology teachers.
With more than 35 topics in Biology, students will learn everything they need in preparation for their exams.
The app has around eight categories that deal with tutorials, formula, possible exam questions, biology practical and dictionary.
If you are a biology lover, you will definite like this app. For students writing exam like WAEC, NECO, JAMB, KCSE, Post JAMB and GCE, this app is for you.

The following topics are covered in this app:

Concept of living thing
Organization of life
Cell and its environment
Cell Structure
Cell as a living form
Cell Properties 
Tissue System
Excretory System
Homeostasis
Respiratory System
Hormonal Coordination
Central Nervous System
Human Sense Organ
Animal Nutrition
Reproductive System
Transport System
Plant Nutrition
Micro-organism and Man
Biology of Heredity
Basis of Heredity
Probability in Genetics
Genetics in Medicine
Physiological Variations
Morphological Variations
Evolution and Adaptation
Theory of Evolution
Component of Eco system
Eco system
Ecological Management
Ecology of Population
Ecological Factors
Food Webs and Trophic Levels
Energy Transformation
Natural Resource
Conservation of Resources

https://play.google.com/store/apps/details?id=de.zkm.bild.molecules
The "Molecules that changed the World" App is meant to convey the scientific facts and interesting stories of molecules that changed our culture, course of civilisation and in short, the world. Among the represented molecules are such basic compounds like water, carbon dioxide, ammonia, which not only influenced the way we think about resources, climate and food production but also affected the development of early life on Earth, and synthetic complex compounds such as nitroglycerin, polyethylene and aspirin. App is aiming at telling you more about the chemical background of such molecules and their influence onto the historical and cultural developments and the life as we know it.

https://www.duolingo.com/
If the benefits of a bilingual brain motivate your students, try this app. 

https://slack.com/intl/es-es
Whether you’re collaborating with other teachers or assigning group project work to students, this app can make communication easier for teams.

 https://www.schoology.com/
Similar to Facebook but it includes the needed security features for school use.

It is an application aimed at students of secondary or higher education, which contains a lot of information for them to experience, it is also a great way to complement the language, since it is completely in English and can be very useful for them to learn vocabulary on the subject and obtain images that can help them in understanding the subject.

In addition, tha fact that it is an app can motivate them with both content and language. I love it and will try it!

Searching for some examples, I have find this on the web. Some professors have added collaborative content creating a complete syllabus of classes prepared to be given, that is why when I will elaborate my syllabus and will prepare my classes, it is going to be really useful. There are many themes related with environment, classified by grades and it is all in English. Great!

This is a magazine that gives you actual info and it will be really good for students. They should learn to search information on internet and get their own judgement! It is a good and truthfull option.