Mobile apps
for iPhone/iPad, Android devices
Web apps
apps that run in the browser
Server-side solutions
back-end services for apps, databases
Design
UI/UX, product features, architecture
Social networks
e.g. Facebook, Twitter, LinkedIn
Online payments
e.g. Stripe, PayPal, PayU, Apple Pay
Maps
e.g. Google Maps, OpenStreetMap
Messaging
e.g. Email, SMS, SendGrid, Twilio, Slack
Storage
e.g. Google Drive, Dropbox
Push notifications
e.g. Firebase, Notification Hubs
Other