Free real spy monitor software for linux

Header Spy is an extension which shows HTTP headers on statusbar.
Main features:
- Up to 5 statusbar panels;
- Request and response headers;
- Custom headers;
- Tooltip headers;
- Menu with headers for statusbar panels;

Skipole Network Monitor project is a simple network monitor with built in web server.

It allows the user to input host IP addresses, it then pings these hosts every five minutes and displays their status via a built-in web server, on port 8000.

So calling http://your_pc_address:8000 will display pages showing green, yellow or red host or group symbols.

Each host is pinged four times every five minutes, and symbols are displayed as:

green : if three or four pings are successfull
yellow : if only one or two are successfull
red : if all four fail

As well as hosts, group symbols are displayed, and can be opened to show hosts, or sub-groups nested within. The operator can create groups, and sub-groups via the gui.

Devel::Monitor is a Perl module that can monitor your variables/objects for memory leaks.

You have memory leaks, and you want to remove it... You can use this tool to help you find which variables/objects that are not destroyed when they should be, and thereafter, you can visualise exactly where is the circular reference for some specific variables/objects.

WHAT IT CANT DO

Even if your modules are memory leak free, it doesnt mean that external modules that you are using dont have it. So, before running your application on mod_perl, you should be sure that EVERY modules are ok. (In particular those perl extensions calling C++ code)

SYNOPSIS

use Devel::Monitor qw(:all);

#-----------------------------------------------------------------------------
# Monitor scalars, arrays, hashes, references, constants
#-----------------------------------------------------------------------------
my ($a,$b) = (Foo::Bar->new(), Foo::Bar->new());
my ($c, @d, %e);
use constant F => [1,2];
monitor(name for a => $a,
name for b => $b,
name for c => $c,
name for d => @d,
name for e => %e,
name for F => &F); #NOTE : Dont add parentheses to the end of the constant (&F())

#-----------------------------------------------------------------------------
# Print circular references
#-----------------------------------------------------------------------------
# NOTE : You cannot use print_circular_ref on a monitored/tied variable
# (See "We cannot use tied objects references because it reuse memory space" doc)
print_circular_ref($a);
print_circular_ref($b);
print_circular_ref($c);
print_circular_ref(@d);
print_circular_ref(%e);
print_circular_ref(&F); #NOTE : Dont add parentheses to the end of the constant (&F())

USAGE : monitor

Example with a circular reference
+----------------------+
| Code |
+----------------------+
{
my @a;
monitor(a => @a);
$a[0] = @a; #Add a circular reference
print STDERR "Leaving scopen";
}
print STDERR "Scope leftn";

+----------------------+
| Output |
+----------------------+
MONITOR ARRAY a
Leaving scope
Scope left
DESTROY ARRAY a

+----------------------+
| Meaning |
+----------------------+
The line "DESTROY ARRAY a" should be between scope prints.
@a were deleted on program exit.

Example without a circular reference

+----------------------+
| Code |
+----------------------+
{
my @a;
monitor(a => @a);
print STDERR "Leaving scopen";
}
print STDERR "Scope leftn";

+----------------------+
| Output |
+----------------------+
MONITOR ARRAY a
Leaving scope
DESTROY ARRAY a
Scope left

+----------------------+
| Meaning |
+----------------------+
Everything is ok

Now that you know there is a circular reference, you can track it down using the print_circular_ref method

GroundWork Monitor Open Source is a complete availability monitoring solution that ensures IT infrastructure uptime while identifying issues before they become real problems.

Unifies best-of-breed open source tools - Nagios*, Nmap, SNMP TT, PHP, Apache, MySQL and more — through PHP/AJAX-based components and an integrated user interface to deliver the extensible functionality you require.

Computer Temperature Monitor is a little applet for the GNOME desktop that shows the temperature of your computer CPU and disks on screen.

It also allows you to log temperatures to a file.

You can set alarms to notify you when a tempertature is reached.

Several monitors can be added to the panel to monitor different sensors. It is designed to look like CPU Frequency Gnome applet, so they match each other on panel.

It is released under the terms of the GNU General Public License.

This applet used to be called Laptop Temperature Monitor

Shell SYStem Monitor a basic console ncurses application for system monitoring.
Shell SYStem Monitor will show things like CPU load, memory load, uptime, Ethernet load (bandwidth usage in KB/s), server time, and more.
Install code:
# cd ssysm
# make
(as root)
# make install
Uninstall code:
(as root)
# make uninstall
Enhancements:
- There was a bug which occurred when outgoing bandwidth exceeds 2GiB, in which the TX bandwidth stays at 0 and TX byte counter sticks to 2GiB.
- This has finally been fixed. However, the byte count still resets to 0 when the interface exceeds 4GiB.