Question: I want to know if there is a good, handy and especially open source Monitoring Tool for Linux Server. I only have SSH and HTTPS access to the server (I don't have a GUI or physical Access).

My requirements:

* Web Interface for the "Host" System which also can run on Smartphones
* Detailed list of Services of a specific server
* Event-Log capturing(it would be nice if it could easily filter the errors and warnings
* Monitoring of Network, Hardware and special Software(if its running) + Ports(if they are in use)
* Secured Access
* E-Mail alert over an external E-Mail Server

I use Debian 8 Wheezy.

Answer: 
Oni, Ghost Browser lets you isolate browsing Sessions in each tab. You can also assign a different proxy for each tab with new Ghost Proxy Control extension. No messing VMs or anything. Everything is right there in one browser window. More details here: <https://ghostbrowser.com/blog/set-different-proxy-for-each-tab/>
Thinking out of the box *and back in* the best that I know of is to use [Virtual Box](https://www.virtualbox.org/) or VMWare to run multiple operating system instances, each with a browser running, possibly "full screen", in tabs.

* If you use a light Linux install as the base for each OS instance the memory consumption will not be much higher than some browsers. [Damn Small Linux](http://www.damnsmalllinux.org/) for example is 50MB and includes a browser and runs in 128 MB of RAM, [NanoLinux](https://sourceforge.net/projects/nanolinux/) is 14 MB and there are several other tiny distributions.
* You can even get 30 day licenced windows distributions, complete with browsers, from Microsoft for test use.
* Complete isolation of the browsers, cache, cookies, file system, etc.
* Virtual Box is Free & Cross Platorm
* VMWare has some free versions