Here's my collection of most useful websites, tools and apps, most of them are free. enjoy!
IFTTT - If This, Then That (IFTTT) is a free way to get your apps and devices working together. For example, you can share your all Instagram posts to Twitter or Facebook automatically by just setting up an Applet.
Qlock - See current time of any city in the world. More than just a world clock
Pdfescape - Do everything instantly for example edit or fill-out PDF files/forms online, no download required.
BitReplica - Keeps your recollections and data safe. Protect necessary documents and the other information on your laptop or desktop computer by backing it up without any charge.
Google Docs - Allow users to view and share any file format of MS Office, documents and presentations online without any kind of installation.
Join.me - Share your computer screen quickly with your friends and family on the internet, or for conference and meeting purposes share your presentations up to 250 viewers simultaneously.
Imgur - Imgur is one of the best online meme sharing community and image host site, founded by Alan Schaaf in 2009.
I Been Pwned - Let user check if their digital accounts, emails or passwords have been compromised in an online data breach.
Wetransfer - Send up to 2 GB files online without registration, secure and free website.
Gingersoftware - A free online spelling/grammar checker tool.
Gtmetrix.com - Check speed performance of your website.
Wordle - An online word-clouds generating tool.
Kleki - A good online alternative to formal 'MS paint'.
Photopea - One of the best Photoshop alternative, it's an online image editor that can open and edit PSD, XCF, Sketch or any other image file types.
Dropshots - Is a non-public photos and videos sharing service on the web.
Mytvworld - Allows to watch free live TV world-wide. Many channels on single website.
Animoto - Super tool for converting pictures into video.
Hootsuite - Mange your all social media accounts from one dashboard.
Getjar - Getjar provides new app recommendations for you every day and gives you free upgrades and unlocks in your favorite apps and games.
Bitly - Convert long website address to the short URL.
Unshorten - Get the real URL of shortened web address.
Alexa - Check how much a website is popular in a specific country or check the global ranking of any blog.
Google Trends - Hot Searches - What is happening around the world, get most popular and hottest news from different categories in a single graphic page, in visual appealing manner.
Visually - World's largest directory of infographics and data visualization.
Fiverr - Earn minimum 5 dollars for each work you will done on Fiverr or hire professionals from many fields for just 5.
Findicons - An icon search engine helps you find free icons.
Unsplash - is a website dedicated to sharing high quality photographs (mean you can use those images for any purpose without any copyright restrictions). Unsplash boasts 850,000 free high-resolution photos.
Kaspersky Virus Desk - Don't worry if you haven't antivirus installed, now scan any file online.
10minutemail - Get temporary email address quickly - your free disposable email account.
Gutenberg - The best source to download eBooks for kindle devices.
Web-capture - is a web-based screenshot service that instantly covert any web page/link to images - with it you can take full page snapshot of a website for free.
Typingweb - Best online typing tutor - improve your typing speed - no registration required.
Answers - The great community website by yahoo - get your answers on any topic.
Bing - The Best alternative search engine of Google.
Mix - Find new and interesting websites and content.
Wordcounter.net - A word and character count tool. You can also use it as a Draft tool.
Did I miss your favorite tool? Let me know in the comment.