Send messages and make free Viber calls.

Cyberduck is a libre server and cloud storage browser for Mac and Windows with support for FTP, SFTP, WebDAV, Amazon S3, OpenStack Swift, Backblaze B2, Microsoft Azure & OneDrive, Google Drive and Dropbox.
Create, edit and publish RSS and podcast feeds.
Access cloud storage just like a USB drive.

Transmission is a cross-platform BitTorrent client.
The best way to use Gmail on your Mac.
Unite allows you to turn any website into a deeply customizable app on your Mac. Merge the modern web with your native macOS apps.
BookMacster is a full-featured, standalone bookmarks manager and cross-browser, multi-Mac bookmarks synchronization tool.
Dash gives your Mac instant offline access to 200+ API documentation sets.
Connect to and manage Linux web servers via a beautiful macOS application, without having to install additional software on your server.
Web-browser, advanced e-mail, newsgroup and feed client, IRC chat, and HTML editing made simple—all your Internet needs in one application.
With Contacts Sync, you can quickly & easily sync your Gmail & Mac contacts so that you can have access to your contacts wherever you go.
Bookmark manager.
Download videos from YouTube, Vimeo, Dailymotion, and more.

WhatRoute is a network diagnostic utility designed for Apple Macintosh computers. Primarily it provides a Traceroute function, but can also perform Ping, Domain Name Service queries, Whois queries and monitor the traffic to and from your computer. The software also uses a Geo-Location service to provide a geographical view of the paths that packets from your computer take as they traverse the Internet.