I found a list of startup tools on http://breue.com/startup_toolkit 
I have tried most of them and I have tried a few others as well. I will be updating(adding a few and removing a few) the list.

https://myventure.in/wp-content/uploads/2015/11/startup-tools.jpg

## MARKET RESEARCH 
https://www.crunchbase.com/ - Details of companies, founders and investors.
https://www.similarweb.com/ - Websites similar to your websites.
https://trends.google.com/trends/ - Compare the usage of two different keywords.

## FORMS 
https://www.surveymonkey.com/ - Forms made easy. Freemium model. 
https://www.typeform.com/ - Good looking forms. Freemium model. 
https://www.google.com/forms/about/ - Basic forms that will get work done.

## USER FEEDBACK 
https://usabilla.com/ - Collect feedback from users as they use use app or website.
https://www.usertesting.com/ - 

## MOCKUPS & WIRE FRAMES 
https://moqups.com/ 
https://www.weld.io/ 
https://proto.io/

## DESIGN 

https://www.sketchapp.com/ - Preferred my designers. 
https://www.invisionapp.com/ - Collaboratives tool for designing.
http://feedbag.io/ 

## Infographics

https://venngage.com/ - Great collection of templates. Freemium model.


## DEVELOPMENT 
https://github.com/ - Code collaboration using git
https://stackoverflow.com/ - QA based website for developers
https://hackernoon.com/ - Good blogs written by entrepreneurs.

## GETTING BETA USERS 
https://www.producthunt.com/ 
https://betalist.com/ 
http://www.startuptabs.com/

## REFERRAL CAMPAINGS
https://maitreapp.co/ - Free until 250 users. API integration and other features in premium accounts. 
https://viral-loops.com - Free trial for 15 days. Pricing is higher compared to https://maitreapp.co/

## PRESENTATIONS 

https://www.canva.com/create/presentations/ - Good looking presentations.
https://www.google.com/slides/about/ - Convenient. Gets the work done.
https://www.slideshare.net/ - If you would like to share your presentations with the world.

## PRODUCT VIDEOS 
http://recordit.co/ 
http://explainify.com/ 
https://www.fiverr.com/stevenanimation/create-an-awesome-2d-animated-video-for-your-project

## PRESS 
https://pr.co/ 
https://www.hey.press/ 
https://press.farm/

## ANALYTICS 
https://analytics.google.com/ 
https://segment.com/ 
https://mixpanel.com/

## CUSTOMER SERVICE 
https://www.olark.com/ 
https://frontapp.com/ 
https://www.zopim.com/

## PROJECT MANAGEMENT 
https://trello.com/ 
https://asana.com/try 
https://basecamp.com/

## PAYMENTS 
https://stripe.com/ 
https://www.braintreepayments.com/ 
https://www.chargebee.com/

## COLLABORATION 
https://slack.com/ 
https://appear.in/ 
https://www.join.me/

## BUG TRACKING 
https://rollbar.com/ 
https://bugherd.com/

## RAISING MONEY 
https://angel.co/ 
https://gust.com/ 
https://www.f6s.com/

## SALES 
https://mailshake.com/ 
http://www.boomeranggmail.com/ 
https://www.streak.com/

## FINANCE 
https://www.free-invoice-generator.com/ 
https://www.freshbooks.com/ 
http://invoiceto.me/

## DESIGN INSPIRATION 
https://dribbble.com/ 
https://onepagelove.com/ 
http://www.uiparade.com/

## FONTS 
https://fonts.google.com/ 
https://www.canva.com/font-combinations/ 
http://www.dafont.com/

## ICONS 
https://thenounproject.com/ 
http://www.flaticon.com/ 
https://icons8.com/icon/new-icons/all

## COLOR PICKERS 
https://coolors.co/ 
https://coneapp.io/ 
http://www.colourco.de/

## TEMPLATES & THEMES 
https://bootswatch.com/ 
https://templated.co/ 
https://html5up.net/

## LOGOS 
https://www.logaster.com/ 
https://99designs.com/ 
https://logojoy.com/

## STOCK PHOTOS 
https://www.pexels.com/ 
https://unsplash.com/ 
http://finda.photo/#v2

## IMAGE OPTIMIZERS 
https://tinyjpg.com/ 
https://kraken.io/web-interface 
https://compressor.io/

## MAKING PRODUCT IMAGES 
https://placeit.net/

## SENDING EMAILS 
https://www.hellobar.com/ 
https://mailchimp.com/ 
https://postmarkapp.com/

## SENDING TEXT MESSAGES 
https://www.twilio.com/

## SOCIAL MEDIA 
https://buffer.com/ 
https://writerack.com/ 
https://www.crowdfireapp.com/

## A/B TESTING 
https://www.optimizely.com/ 
https://unbounce.com/

## BLOGGING 
https://medium.com/ 
http://www.hemingwayapp.com/ 
http://www.zenpen.io/

## CALENDARS 
https://calendar.google.com/calendar/ 
https://calendly.com/ 
http://rallly.co/

## SIGNING DOCUMENTS 
https://www.hellosign.com/

## LEGAL DOCUMENTS 
http://www.docracy.com/

## OPERATING AGREEMENT 
http://www.docracy.com/0t3ficebtbo/llc-operating-agreement

## INCORPORATING 
https://www.clerky.com/

## NDA 
http://www.docracy.com/27/generic-shortform-nda

## NETWORKING 
https://www.generosity.com/ 
http://founderdating.com/ 
https://cofounderslab.com/

## STORAGE 
https://www.google.com/drive/ 
https://www.dropbox.com/ 
https://www.box.com/

## HIRING 
https://hired.com/ 
https://www.vettery.com/ 
https://www.greenhouse.io/

## APIs 
http://apis.io/ 
http://apilist.fun/ 
https://www.programmableweb.com/

## LEARNING 
http://paulgraham.com/articles.html 
http://startupery.com/ 
https://www.ycombinator.com/resources/

## BOOKS 
https://www.amazon.com/Zero-One-Notes-Startups-Future/dp/0804139296 
https://www.amazon.com/Creativity-Inc-Overcoming-Unseen-Inspiration/dp/0812993012/ 
https://www.amazon.com/Lean-Startup-Entrepreneurs-Continuous-Innovation/dp/0307887898/