There’s nothing more frustrating than sending an important email and wondering if the person actually opened it. Well, wonder no more! Signals, made by Hubspot, let’s you see who opens your email.

Signals integrates with Gmail (and Google Apps accounts), Apple Mail, Outlook for Windows, Outlook.com and Outlook Web Access. Signals also hooks up to Salesforce and Hubspot, letting you know instantly if you have a lead or a warm prospect visiting your site.

Cost: Free (200 notifications/month); $10/month/user (unlimited notifications)

Need to create a nice-looking graphic with a quote, then share it with your social networks? There are several good sites/apps to do this. My favorites include:

QuotesCover
Recitethis
Quozio

Cost: Free

Want to be more productive on the go? Quickoffice lets you run Office documents on mobile devices (Androids, iPhones and iPads).

Once you sign in with a Google Account, you can save your work in Google Drive and access your files from any mobile device or computer.

Use Quickoffice and a Google Account to:

• Create and edit Word, Excel and PowerPoint files
• Access files in Google Drive and on your device
• Open and view PDF files
• Share files through previously shared Google Drive folders
• Attach files to emails

Cost: Free