I hope this is useful.

As there are quite a lot of resources here I've made a alphabetical list with links. Now you don't have to wade through the whole tutorial to find what you need.

All the Free Stock - http://allthefreestock.com/

Audiojungle - http://audiojungle.net/

Bitly - https://bitly.com/

BlogTopicGenerator - http://www.hubspot.com/blog-topic-generator

Bubbl.Us - https://bubbl.us/

Buffer Freeplan - https://buffer.com

Builtwith - http://builtwith.com/

Canva - https://www.canva.com/

Chartgo - http://www.chartgo.com/

Contact Form 7 - http://contactform7.com/

Copyscape - http://www.copyscape.com/

Da Button Factory - http://dabuttonfactory.com/

Death to the stock photo - http://deathtothestockphoto.com/

Designers Pics - http://www.designerspics.com/

Diigo - https://www.diigo.com/

Dmoz - https://www.dmoz.org/

Dropbox - https://www.dropbox.com

E.ggtimer.com - http://e.ggtimer.com/

Editorial Calendar WP - https://wordpress.org/plugins/editorial-calendar/

Feedly - https://feedly.com

Freebbble - http://freebbble.com/

Fiverr - https://uk.fiverr.com/

Foodie's feed - https://foodiesfeed.com/

Free Headline Analyser - http://coschedule.com/headline-analyzer

Google Alerts - https://www.google.com/alerts

Google Drive - https://www.google.com/drive

Google pagespeed test - https://developers.google.com/speed/pagespeed/insi...

Google URL Shortener - https://goo.gl/

Grammarly - https://www.grammarly.com/

Gratisography - http://gratisography.com/

Hemmingway - http://www.hemingwayapp.com/

Hootsuite - https://hootsuite.com/

IM Free - http://www.imcreator.com/free

Imageoptimizer - http://www.imageoptimizer.net/Pages/Home.aspx

Images To GIF Maker - https://imgflip.com/images-to-gif

Incompetech - http://incompetech.com/

Internet Crime Complaint Centre - http://www.ic3.gov/default.aspx

ISO Republic - http://isorepublic.com/

Jay Mantri - http://jaymantri.com/

Kaboompics - http://kaboompics.com/

LastPass - https://lastpass.com/

Life of Pix - http://www.lifeofpix.com/

List.ly - http://list.ly/

Mail Chimp - http://mailchimp.com/

Mashable - http://mashable.com/

Melodyloops - http://www.melodyloops.com/

Monosnap - https://monosnap.com/welcome

Moodboard - http://www.gomoodboard.com/

Morguefile - https://www.morguefile.com/

Muvizu - https://www.muvizu.com/ Free trial

newoldstock - http://nos.twnsnd.co/

Upwork - https://www.upwork.com/ Formally Odesk

Overstream - http://www.overstream.net/

Pexels - https://www.pexels.com/

PicJumbo - https://picjumbo.com/

Picography - http://picography.co/

Pinstamatic - http://pinstamatic.com/

Pixaby - https://pixabay.com/

Pixlr - https://pixlr.com/

Pond5 - http://www.pond5.com/

PowToon - http://www.powtoon.com/

Premium Pixels - http://www.premiumpixels.com

Recite - http://recite.com/

Reddit - https://www.reddit.com/

Screen Cast 0 Matic - http://screencast-o-matic.com/home

Screen Flow - http://www.telestream.net/screenflow/overview.htm

SimilarWeb - http://www.similarweb.com/

Snapographic - http://snapographic.com/

Social Image Resizer Tool - http://www.internetmarketingninjas.com/seo-tools/f...

splitshire - http://www.splitshire.com/

Startup stock photos - http://startupstockphotos.com/

Stat Counter - https://statcounter.com/

Stockmusic - http://www.stockmusic.net/

Stokpic - http://stokpic.com/

Storyboard That - http://www.storyboardthat.com/

Sumome - https://sumome.com/

Text Broker - https://www.textbroker.com/

The Pattern Library - http://thepatternlibrary.com/

TinyJPG - https://tinyjpg.com/

Travel Coffee book - http://travelcoffeebook.com/

Trello - https://trello.com/

Tweriod - http://www.tweriod.com/

Twubs - http://twubs.com/

Ubersuggest - http://ubersuggest.org/

Unsplash - https://unsplash.com/

Website Grader - https://website.grader.com/