How to set up cross-platform web development?

Question

SSH

I dream of finding the same way for interaction for different operating systems.
Configurations are available with Windows 7, Windows 8, Ubuntu 14, Mac OS 10.9.2. I actively use all computers (something at home, something at work).
My usual tasks are:
1) Log in to remote servers via SFTP (download, delete, edit files).
2) Sometimes have access to SSH.
On Windows I use WinSCP, Putty, SublimeText3
On Mac OS - Cyberduck, iTerm, SublimeText3
On Ubuntu - Nautilus mount, terminal, SublimeText3
Most of all I like the approach in Windows, because WinSCP + Putty can store passwords and in WinSCP it is more convenient to copy from the local machine to the server due to the division of the window into 2 parts. You can use Wine on two other operating systems, but suddenly there is a more elegant solution, even if it loses some of the conveniences that you are used to.
From what came to my mind, but did not fit: plugin for SublimeText (no convenient navigation through the directory tree), extension for Google Chrome (could not find a free SFTP client + those extensions that I tried for SSH do not remember passwords).

Answer 1

1) set up authorization by keys (and prohibit by passwords, because the Chinese will pick it up sooner or later)
2) mc (midnight commander) for mac / linux, far for windows?
And if we talk about graphical file managers, then:
3) I don’t use gnomes and units (and ubuntu, to be honest), but in KDE, for example, the file manager (dolphin) can split tabs into two panels by hotkey (and from the menu) . It seemed to me that with all the popularity of ubunta, nautilus should also be able to do this.
4) In macos, it seems, there was also something to divide the finder into two panels. But the last time I saw makos was a very long time ago, so I won’t tell you much now :)