"Features as a service" APIs

1. Data Enrichment

1.1. Clearbit

1.2. Email Hunter

1.3. FullContact

2. Others

2.1. Textio (TextBox API)

2.2. Picatic (events)

3. Social

3.1. TapGlue

4. eCommerce

4.1. Semantics3

5. Booking / calendar

5.1. Timekit

5.2. Cronofy

5.3. Periodic

6. Voucher

6.1. voucherify

7. User management

7.1. YesGraph (Referral)

7.2. StormPath

7.3. oAuth.io

8. Search

8.1. Algolia

8.2. Dextro

9. Dashboards

9.1. Keen.io

9.2. Reflect.io

10. Messaging

10.1. Layer

10.2. BuddyCloud

10.3. Imoji

10.4. SendBird

11. geo

11.1. MapBox

12. file management

12.1. Cloudinary

12.2. FileStack