AngelList

The easiest and most private way to share things with your significant other (YC W12)

Share like you do in real life, in intimate Circles

"iMessage for Android". SMS/Call sync between any computer/tablet and your Android phone.

Real-time mobile communication

HIPAA-Compliant Group Communication Platform, YC W2012, StartX F2011

Let your friends make decisions for you.

Provides offices with an iPad Receptionist to communicate with their visitors.

Hands free voice texting (YC W12)

Instant, affordable audience response without clickers, using any mobile device.

Always feel CONNECTED

Social Mobile Calendar on Facebook

OpenTable for Casual Dining.

We're bringing the mobile revolution to politics.

Web & Smartphone Instant Messanger with 250m downloads.

Proactive medical care via phone, SMS and email.

Paid-To-Text - Smart Mobile Coupons

Customer experience management software for restaurants

GROU.PS is a social groupware platform with 3.5MM muv. It's the Y! Groups of Facebook era

Presence aware mobile messaging

Turnkey mobile marketing for SMBs.

Private Group: Coordination + Conversations + Check-ins

Kick ass software for managing, monitoring and measuring your marketing efforts

Chat Rooms for Texting

Mobile payments