Cacoo - Create diagrams online

Cacoo is a user friendly online drawing tool that allows you to create and share a variety of diagrams such as site maps, wire frames, UML and network charts. Cacoo can be used free of charge.

Website: Cacoo - Online diagrams and charts maker - https://cacoo.com/
Price: Free - $4.95 to $99 month - Cacoo Plans Pricing
Alternative Desktop Software: Diagram Designer - Visio - SmartDraw

Evernote - Online note taking

Capture all of your thoughts, ideas, and inspirations, into a single place. Access everything whenever you need it from your PC, even when offline. Evernote allows you to easily capture information in any environment using whatever device or platform you find most convenient, and makes this information accessible and searchable at any time, from anywhere.

 Website: Evernote - Online note taking application

Dropbox - Store and sync files online

Dropbox is a storage application and service operated by Evenflow, Inc. The service enables users to store and sync files online and between computers.Files in the Dropbox folder may then be shared with other Dropbox users or accessed from the web. A free Dropbox account offers 2 GB of storage. Users may upgrade to 50 GB by paying a monthly or yearly fee.

Website: Dropbox -  to store and sync files online and between computers

PDFmyURL - Convert any web page to PDF

PDFmyURL is a new tool that lets you convert any url / webpage to a .pdf and download it instantly. The online tool is free and easy to use - simply enter the url you want converted, click the button, and receive the .pdf on your desktop.

 PDFmyURL - Converts any URL to PDF