Best of Product Hunt|Week of May 18, 2015

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1. Pexels 2.0The best free stock photos in one place

Web App•Design Tools•Photography

4. Elon Musk BiographyA book on Tesla, SpaceX, & the quest for a fantastic future

Startup Books•Space•Books

3. Slack ListA handpicked selection of the top Slack groups

Messaging•Tech

1. Popcorn Time In Your BrowserWatch movies instantly on the web for free

Streaming Services•Tech

Viktor.com

2. InboxSDKFirst usable API to write Gmail Apps for 1B active users

Web App•Email•API

13. freeCodeCampLearn to code for free

Charity & Giving•Education•Software Engineering

5. AutomaticTurn your car into a smart car

Android•iOS•Cars

15. Noisli 2.0Improve focus and boost your productivity with ambient noise

iOS•iPad•Web App

6. Google ToneExchange URLs with nearby computers (using sound)

Web App•Tech•Search

Fin Startups get Fin free for a year + 93% off Intercom

Customer Communication•SaaS•Artificial Intelligence

7. ParibusGet refunds you didn't know you had coming, effortlessly

Web App•Payments•Tech

25. Invoice.toA simple & beautiful invoice generator with Stripe & Paypal

Web App•Productivity•Freelance

14. ParagraphsA minimalist writing app for Mac

Mac•Writing•Tech

8. Spotify NowVideo, podcasts, smart playlists & more (pre-launch)

Music•Spotify•Streaming Services

12. DiffbotExtract content from articles, products, videos and more

API•Artificial Intelligence•Tech

LightfieldAI-native CRM that builds itself and does work for you

Sales•Artificial Intelligence•CRM

17. IconjarOrganize, search and use icons the easy way

Mac•Icons•Tech

9. DocadyKeep tabs on every important piece of paperwork in your life

Productivity•Tech

22. Film HuntBrowse top rated movies by genre and year

Video Streaming•Movies•Streaming Services