Useful Widgets & Third party sites

Sharing

• http://www.addthis.com
• http://www.sharethis.com

Comet (Push)

• http://pusher.com (Pusher is a hosted API for quickly, easily and securely adding scalable realtime functionality to web and mobile apps)

Chats

• http://www.olark.com

Support & loyalty

• http://assistly.com / http://desk.com (support)
• http://www.zendesk.com (support)
• http://tenderapp.com (support)
• http://www.snapengage.com (integrates to ZendDesk - http://www.snapengage.com/zendesk)
• http://www.punchtab.com

Social Referrals

• http://extole.com/products

Sending Emails

• http://sendgrid.com (SMTP can be configured very easy!)
• http://mailchimp.com
• http://www.campaignmonitor.com
• http://mailgun.net
• http://postmarkapp.com

Translation Tools

• http://crowdin.net

Social Comments integration

• http://intensedebate.com
• http://disqus.com

Web Analytics

• http://getclicky.com

Screencasts

• http://www.screenr.com