Safari Software
Adblock Plus
Adblock Plus is a free extension that allows you to - among other things - block annoying ads, disable tracking and block domains known to spread malware.
uBlock Origin
Popular and efficient blocker for Chromium, Chrome, Edge, Firefox, Opera, Safari, Thunderbird. Fast and lean.
DuckDuckGo
DuckDuckGo is an alternative search engine that has rich features, respects your privacy, and is built from free/open-source software.
XMarks
Discontinued
LastPass has retired Xmarks from its line of products as of May 1, 2018. After that date, you will no longer have access to Xmarks.
Xmarks is a cross-browser, bookmark-synchronization service for Internet Explorer, Firefox, Chrome, Safari, iPhone, Android & iPad.
1Password
1Password creates strong, unique passwords for all of your sites and logs you in with a single tap (or click).
Todoist
Todoist is a task manager thats useful, fast and easy to use. Accomplish more, every day.Millions of people rely on Todoist to get things done.
AdBlock
Your favorite feature in 
Mozilla Firefox finally comes to 
Google Chrome, https://alternativeto .
Diigo
Better reading and research with annotations, highlighter, sticky notes, archiving, bookmarking and more.
Pushbullet
Pushbullet is the easiest and fastest way to send links, pictures, files, lists, notes, and more right into your phone's notification tray, to your computer, or to a friend...
TinEye
TinEye is a powerful image search and recognition engine that can help to find where an image came from and how it's being used.
uBlock
Discontinued
The project seems to be no longer developed. Last version, v0.9.5.2, released in June 2015, can be still downloaded from the official website.
Enjoy a faster, cleaner web.uBlock enhances your browsing experience, efficiently blocking any clutter and overhead disturbing your experience.
Raindrop.io
Save Anything from Around the Web, organize with ease, ind your content with search, and collaborate.
Bitwarden
Bitwarden is the easiest and safest way to store your logins and passwords across all of your devices (iOS, Android, Chrome, Firefox, Opera, Windows, Mac, Linux, and more). Bitwarden is FREE and open source.
Grammarly
Grammarly Editor is an automated proofreader that corrects contextual spelling mistakes, checks for more than 250 common grammar errors, enhances vocabulary usage, and suggests...
Buffer
With Buffer all you do is put a few tweets in your Buffer and the app schedules them for you throughout the day.
Mindomo
Mindomo is the easiest online software for creating mind maps, concept maps, outlines and various other types of diagrams.
Readability
Discontinued
The Readability bookmarking service shut down on September 30, 2016.
Readability turns any web page into a clean view for reading now or later on your computer, smartphone, or tablet. Clean Up Cluttered Pages
Stylish
Warning
Stylish was acquired by the SimilarWeb, a web research company, in 2017. Robert Heaton, a software engineer at Stripe, reported that, since that time, the extension tracks the browsing history of its users: https://robertheaton.com/2018/07/02/stylish-browser-extension-steals-your-internet-history/
Restyle the web with Stylish, a user styles manager. Stylish lets you easily install themes and skins for websites and even customize Firefox and other programs themselves.
Disconnect
Disconnect was founded in 2011 by former Google engineers and a consumer- and privacy-rights attorney.