Proteopedia is described as 'Protopedia is a wiki style database containing information on a wide array of biological macromolecules' and is an website in the Education & Reference category. There are more than 10 alternatives to Proteopedia, not only websites but also apps for a variety of platforms, including Android, iPhone, iPad and MediaWiki. The best alternative is Wikipedia, which is both free and Open Source. Other great sites and apps similar to Proteopedia are Wikiversity (Free, Open Source), Encyclopædia Britannica (Freemium), Scholarpedia (Free, Open Source) and Golden (Freemium).
Wikipedia is a free, multilingual encyclopedia project supported by the non-profit Wikimedia Foundation. Wikipedia has 17 million articles (3.5 million in English), which have been written collaboratively by volunteers around the world.
Wikiversity is a Wikimedia Foundation project devoted to learning resources, learning projects, and research for use in all levels, types, and styles of education from pre-school to university, including professional training and informal learning.
Scholarpedia is a peer-reviewed open-access encyclopedia written and maintained by scholarly experts from around the world. Scholarpedia is inspired by Wikipedia and aims to complement it by providing in-depth scholarly treatments of academic topics.