Wikipedia

Wikipedia is a free, multilingual encyclopedia project supported by the non-profit Wikimedia Foundation. Wikipedia has 17 million articles (3.5 million in English)...

Free Open Source Web Android iPhone Blackberry Android Tablet ... iPad Kindle Fire MediaWiki

1343 Like

Remember The Milk

Take your tasks anywhere with this feature-packed application. See tasks located nearby, add and complete tasks on the go, organize upcoming tasks, and sync it all...

Freemium $ $ $ Mac Windows Linux Web Android ... iPhone Android Tablet iPad Blackberry 10

335 Like

FANDOM

FANDOM is a community-based service that allows anyone to create a wiki on virtually any subject. Discover, share and add your knowledge! Wikia is financed by...

Free Web

54 Like

Infogalactic

Infogalactic is an Internet-based, free-content encyclopedia project that is a dynamic fork of Wikipedia and improves upon the online encyclopedia's model of openly...

• Warning The articles are not accurate, out of date and politically spun.

Free Web

17 Like

Miraheze

Miraheze is a wiki farm (hosts wikis) for free and with no ads, it also provides custom domains, extensions and many other features.

Free Open Source Web

10 Like

Oppia

Oppia is a free, open-source learning platform. Full of interactive activities called 'explorations', Oppia helps curious minds learn and teach.

Free Open Source Mac Windows Linux Web Self-Hosted

4 Like

Top Task List

Top Task List is simple, elegant and responsive task organizer. You can turn a task into a start screen tile, give it custom colors, priorities, edit multiple tasks at...

Free Windows Phone

6 Like

Notepad Checklist

A checklist made by notepad.pw, easy short and fun to use.

Commercial Mac Windows Linux Web Windows Mobile ... Android iPhone Blackberry Chrome OS Windows S Android Tablet Windows Phone iPad Self-Hosted Blackberry 10 PlayBook Apple TV Kindle Fire

Cheddar

Cheddar keeps your world organized. It's easy to use on your iPhone, iPod touch, iPad, and on the web. Cheddar is super simple and instantly in sync on all of your...

Free Web

3 Like

Stubia

Stubia is a mobile encyclopedia that limits each article to 160 characters: this limitation makes each topic easy to understand.

Free Web

3 Like

Alchetron

Alchetron.com is a free social encyclopedia for world where you can create, organize and learn easily using topics. With Alchetron you can search & share...

Free Mac Windows Linux Web Android ... Chrome OS Android Tablet

3 Like

WinMilk

WinMilk is a Windows Phone client for the to-do list service 'Remember the Milk'. WinMilk lets you view your RTM tasks by date, list, smart list and tag, as well...

Free Open Source Windows Phone

5 Like

Conqu

Conqu is an easy to use yet powerful task management tool designed to help you conquer your inbox and get things done. With Conqu, you can organize the tasks by criteria...

• Discontinued iOS app last updated in 2012, Android app in 2013.

Freemium Mac Windows Linux Android iPhone ... Blackberry Android Tablet iPad

19 Like

cloudList

cloudList helps you & your friends organize your busy lives together. You can share grocery / shopping lists. Make a collaborative task checklist, party playlist, to...

Freemium Web Android

4 Like

Citizendium

A wiki for providing free knowledge where authors use their real, verified names.

Free Open Source Web

1 Like