YC Winter 2011 B2B Startups

Y Combinator's Winter 2011 batch included 23 B2B startups. Of these, 6 remain active, 10 have been acquired, and 7 have shut down.

• Zerocater (140 people) — Zerocater is revolutionizing how companies feed their employees
• Talkable (76 people) — Online store referrals.
• HelloSign (100 people) — eSignature software for small and mid-market businesses.
• Tumult (1 people) — Tumult is building the next generation of apps for web design. Our…
• Upverter (11 people) — The future of hardware design. A marketplace for hardware engineering…
• Earbits (15 people) — Google AdWords for music. Allowing bands and labels to bid for…
• Custora (11 people) — Custora is a predictive analytics platform for e-commerce marketing…
• Hotspots (2 people) — Real-time analytics (acq by TWTR, 2012)
• Userfox (2 people) — User retention as a service. Drip email
• Mailgun (51 people) — Email API service.
• AppHarbor (1 people) — .NET Cloud Platform as a Service
• Flotype (2 people) — Third generation of web apps.
• Fivestars (201 people) — Customer loyalty and payments platform for small businesses.
• SingleStore (150 people) — The cloud-native, operational database built for speed and scale.
• Beetailer (2 people) — Facebook stores.
• TellFi (2 people) — Google Voice for business.
• Sendoid (2 people) — High speed peer to peer data transport technology for consumers…
• Close (120 people) — CRM and sales automation tools for startups and SMBs
• Siasto (2 people) — Siasto is a collaboration tool designed for SMBs who use Google Apps,…
• TalkBin — Consumer to business messaging.
• Acunote
• Apportable (51 people) — iOS porting
• Venuetastic (2 people) — Venue marketplace.