Free swap software for linux

swapd is a dynamic swap creation deamon, it monitors the system memory and detect when swap creation will be required. the swap size is determined automatically with respect of sysadmin limits.
Installation:
- Make sure you are logged in as root.
- Run make install.
- Take a look at /usr/local/etc/swapd.conf and change what is necessary.
- Create the swap directory you chose in swapd.conf (it should be accessible only by root).
- Add the following line to /etc/rc.d/rc.local:
/usr/local/sbin/swapd
- If you recompiled the kernel, now would be the time to reboot. If you havent, just rehash and run swapd as root.

The cryptoswap package supports building an encrypted swap partition when a system boots. This must be necessary on systems that use encrypted filesystems because plaintext secrets may be written to disk when memory is swapped to disk.
Cryptoswap.sh should be installed in /etc/init.d. During system boot, cryptoswap.sh should execute right before checkroot.sh. When shutting down, cryptoswap should execute after sysklogd.
This package also includes an initialization script for building loopback encrypted /tmp. This may be necessary if a system contains encrypted filesystems but / is not encrypted. A link from directories like /var/tmp to /tmp may be appropriate. There are a few other alternatives for systems such as these:
1. Tmpfs is a Linux kernel feature that allows /tmp to exist in memory. This is a good solution for systems with a lot of memory and/or (encrypted) swap.
2. If you have a system that uses encrypted home directories, per-user temporary directories inside $HOME could be used. This would ensure that users data is protected but would require that all applications use $HOME/tmp instead of /tmp.
Finally, the project may be used to create an encrypted root filesystem. Doing so requires two special partitions. First, create a small partition to hold your kernel and initrd image, /dev/hdaX. Second create a large partition to contain the root of your filesystem, /dev/hdaY.
Next configure and install an initrd-based boot system:
1. Ensure romfs is compiled in your kernel (not a module).
2. Create a kernel-supported filesystem on /dev/hdaX and copy your kernel to /vmlinux.
3. Download busybox and extract it as initrd/busybox.
4. Update initrd/src/etc/modules.initrd to include any modules needed to boot.
5. Build cryptoswaps initrd image (cd initrd && make initrd) and copy it to the filesystem on /dev/hdaX at /initrd.img.gz.
6. Make sure you use literal = "root=/dev/ram0 init=/linuxrc rw" or LILO equivalent.
Finally, create a proper encrypted filesystem on /dev/hdaY:
1. Randomize the partition: dd if=/dev/urandom of=/dev/hdaY.
2. Set up a loopback device: openssl enc -d -aes-256-ecb -in initrd/src/etc/efsk | losetup -p0 -e aes /dev/loop0 /dev/hdaY.
3. Create the root filesystem: mkfs.ext2 /dev/loop0.
4. Mount your new root filesystem: mount /dev/loop0 .
5. Populate your new root filesystem.
Enhancements:
- Added initrd build environment.
- Documentation update.

wmsm.app is a WindowMaker System Monitor.
Main features:
- Processor load
- Memory load
- Swap load
- Disk I/O (read/write)
- Uptime
- Two different scale types
Installation:
cd wmsm
make
make install (root)
Enhancements:
- added -d < dev > option to select the device that should observe, e.g. hda or sda (thanks to Carles Garrigues and krakov)
- added small point befor IOR and IOW only if the change of IOR or IOW was to small to display with the scale. Result: .IOR or .IOW

Atop project is an ASCII full-screen performance monitor, similar to the top command.
At regular intervals, it shows system-level activity related to the CPU, memory, swap, disks and network layers, and it shows for every active process the CPU utilization in system and user mode, the virtual and resident memory growth, priority, username, state, and exit code.
The process level activity is also shown for processes which finished during the last interval, to get a complete overview about the consumers of things such as CPU time.
Atop only shows the active system-resources and processes, and only shows the deviations since the previous interval.
Enhancements:
- A new command, atopsar, has been added to generate detailed system activity reports (similar to the UNIX command sar) using the compressed logfiles as written by atop.
- These reports can also be generated for the current situation by specifying an interval for atopsar on the command line.

w3cam is a simple CGI to retrieve images from a so called video4linux device. In other words this program will only run on Linux machines which support a video4linux-device.
w3cam supports a text mode and a gui mode. In the gui mode a html with a form is supplied to change some parameters with the mouse ..
Supported output formats: [6]PNG, [7]JPEG and PPM
Screen dumps in GUI mode [8]double.jpg
Installation: run configure & make install and edit the installed w3cam.cgi.scf file for the runtime configuration.
Usage: Install the CGI and then call {url}/w3cam.cgi?help
Download source code: [9]w3cam-0.7.2.tar.gz
Needed Libraries: [10]libz, libpng, libjpeg
Checkout [11]ChangeLog for changes since the last release.
Tips:
Dont use refresh=0 if you are not the only one, who want to access the video, cause this will lock the v4l device.
Set refresh=-1 if the image is NOT embedded in a HTML-page (or set it at compile time as the default or at runtime in the configuration file).
Use w3cam.css to change the layout (dont forget to install and define the URL in the config file..)
Problems?: [13]Mini FAQ, and also consult the included documentation and HTML samples.
Enhancements:
- released 0.7.2
- w3cam.cgi: added default input in the gui mode
- added new option "bgr=1" to swap RGB24 to BGR24
- fixed v4l.c:v4l_set_input() for the ov511 driver

Suspend2 allows you to hibernate your machine without needing APM, BIOS, or ACPI support.
Suspend2 creates an image that is saved in your active swap partitions, swap files, ordinary files or (soon) across a network.
At the next system boot, the kernel detects the saved image, restores the memory from it and then it continues to run as if youd never powered down.
Enhancements:
- Since 2.2-rc12, there have been further bug fixes and a few enhancements.
- The software is now in feature freeze, getting prepared for seeking to merge into the vanilla kernel.

cfgstoragemaker remotely generates an MRTG config file in order to graph all storage devices (disk, memory, and swap) of one or more specific host(s) via SNMP.