Operating system : Windows , Linux

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Avast! Antivirus is an antivirus program developed by AVAST Software. It was first released in 1988. Avast! is based on a central scanning engine that is certified by ICSA Labs and West Coast Lab's Checkmark process and incorporates anti-spyware technology, also certified by West Coast Lab's Checkmark process, as well as anti-rootkit and self-protection capabilities. It is a multiple recipient of the Virus Bulletin VB100 Award, for detection of 100% of "in-the-wild" viruses,  and is a past winner of the Secure Computing Readers' Trust Award. The name Avast comes from "Anti-Virus-Advanced-Set".

Avast! Free Antivirus is the freeware version of Avast! antivirus software available to Microsoft Windows and Linux users, while Avast! Pro Antivirus is offered to businesses and users that want additional features. Priority updates are delivered automatically using PUSH update technology in Avast! Pro Antivirus. Avast! Pro Antivirus also has a command line scanner and a script blocker.

Avast! Antivirus is a widely used antivirus program, with 100 million users worldwide as of December 2009

Operating system : Windows, Linux, FreeBSD

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AVG is an umbrella term for a range of anti-virus and Internet security software for the Microsoft Windows, Linux, Mac OS X, and FreeBSD  computing platforms, developed by AVG Technologies, a privately held Czech company formerly known as Grisoft.

Features

AVG features most of the common functions available in modern anti-virus and Internet security programs, including periodic scans, scans of sent and received emails (including adding footers to the emails indicating this), the ability to "repair" some virus-infected files, and a "virus vault" in which infected files are held (A quarantine area; also known as a "virus chest").

LinkScanner

The patent pending LinkScanner technology acquired from Exploit Prevention Labs and built into most AVG products, provides real-time protection against exploits and drive-by downloads. LinkScanner includes: Search-Shield – a safe search component that places safety ratings next to each link in Google, Yahoo! and MSN search results; plus Active Surf-Shield – a safe surf component that scans the contents of a web site in real-time to ensure it's safe being opened. A faulty upgrade in 8.0.233 causing users to lose internet access, as well as concerns regarding web analytics have made LinkScanner a controversial component (see "LinkScanner Concerns").

Concerns

Initial AVG Anti-Virus upgrades for version 8.0.233 contained a malfunction in the AVGNSX.exe process, blocking network activity and internet access. The AVGNSX.exe process is part of the LinkScanner utility. Current versions of avg are unaffected, as the product is at revision 9.0.xxx.

When AVG 8.0 was first released, its LinkScanner safe search feature was shown to cause an increase in traffic on web sites that appear high in search engine results pages. Since LinkScanner disguises the scans as coming from an Internet Explorer 6 browser when it prescans each site listed in the search results, web site usage logs showed incorrect and overinflated site visitor statistics. The prescanning of every link in search results also caused web sites to transfer more data than usual, resulting in higher bandwidth usage for web site operators and slow performance for users. AVG initially said site administrators would be able to filter the LinkScanner traffic out of their site statistics, leaving the problem of excess bandwidth usage still to be solved. Pay-per-click advertising was not affected by the increase in traffic.

In response to complaints, AVG announced that as of July 9, 2008 "Search-Shield will no longer scan each search result online for new exploits, which was causing the spikes that webmasters addressed with us", releasing a new build on that date that applies a local blacklist, then prefetches and scans only those links clicked on by the user.

Resource requirements

AVG had been known for its conservative resource requirements during its version 6.0 run. The AVG Anti-Virus Professional Edition required 16 MB of RAM and 20 MB of space on the hard drive.

Version 7.5 of AVG Free requires a Pentium (or compatible) CPU with 300 MHz and between 64–256 MB of RAM, depending on operating system (at least 64 MB with Windows 9x, at least 128 MB with Windows 2000 or newer, with more RAM recommended).

An additional caveat with version 7.5 in Windows XP, which is a multi-user system that allows more than one user to be logged in at a time, is that scheduled scans ran as separate processes, which created a situation in which there were two scheduled scans, one in each active account, running simultaneously and causing heavy hard disk throttling and considerable system lag. This fault was finally fixed in version 8.0 of the program.

Currently, both AVG Anti-Virus and AVG Internet Security require at least 256 MB of RAM for the computer as a minimum. The comparatively high use of paged physical RAM has led to crashes with some software, such as the Half-Life 2 series

Operating system : Cross-platform

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A powerful toolset for rescue & repair of infected machines.

The AVG Rescue CD is a powerful must-have toolkit for the rescue and repair of infected machines. It provides essential utilities for system administrators and other IT professionals and includes the following features:

* Comprehensive administration toolkit
* System recovery from virus and spyware infections
* Suitable for recovering MS Windows and Linux operating systems (FAT32 and NTFS file systems)
* Ability to perform a clean boot from CD or USB stick
* Free support and service for paid license holders of any AVG product
* FAQ and Free Forum self-help support for AVG Free users

Key technologies

* Anti-virus: protection against viruses, worms and Trojans
* Anti-spyware: protection against spyware, adware and identity theft
* Administration toolkit: system recovery tools

The AVG Rescue CD is essentially a portable version of AVG Anti-Virus supplied through Linux distribution. It can be used in the form of a bootable CD or bootable USB flash drive to recover your computer when the system cannot be loaded normally, such as after an extensive or deep-rooted virus infection. In short, the AVG Rescue CD enables you to fully remove infections from an otherwise inoperable PC and render the system bootable again.

Apart from the usual AVG functions (malware detection and removal, updates from internet or external device, etc.), the AVG Rescue CD also contains the following set of administration tools:

* Midnight Commander - a two-panel file manager
* Windows Registry Editor– simple registry editor for more experienced users
* TestDisk - powerful hard drive recovery tool
* Ping - to test the availability of network resources (servers, domains, IP addresses)
* Common Linux programs and services– vi text editor, OpenSSH daemon, ntfsprogs etc.

Free of charge

The AVG Rescue CD is a free-to-use product that anyone can download. This also covers any new program versions and virus database updates. If you have any other paid AVG license, you are also entitled to receive our full technical support.

Operating system : Windows 2000, XP, Vista, 7, Mac OS X Tiger (Universal Binary), Mac OS X Leopard (Universal Binary)

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Create 3D models and share them with the world

Google SketchUp is software that you can use to create 3D models of anything you like.

Most people get rolling with SketchUp in just a few minutes. Dozens of video tutorials, an extensive Help Center and a worldwide user community mean that anyone who wants to make 3D models with SketchUp, can.

Model anything you can imagine.

Redecorate your living room. Design a new piece of furniture. Model your city for Google Earth. Create a skatepark for your hometown, then export an animation and share it on YouTube. There's no limit to what you can create with SketchUp.

Get models online for free.

You can build models from scratch, or you can download what you need. People all over the world share what they've made on the Google 3D Warehouse. It's a huge, searchable repository of models, and it's free.
On April 27, 2006, Google announced Google SketchUp, a freely-downloadable version of SketchUp. The free version is not as capable as SketchUp Pro, but it includes integrated tools for uploading content to Google Earth and to the Google 3D Warehouse, a repository of models created in SketchUp. They have also added a new toolbox where you can walk, see things from a person's point of view, labels for models, a look around tool, and an "any polygon" shape tool.

While the free version of Google Sketchup can export 3D to SKP, .dae and Google Earth's .kmz file format, the Pro version extends exporting support to include the .3ds, .dae, .dwg, .dxf, .fbx, .obj, .xsi, and .wrl file formats.

Google SketchUp can also save "screenshots" of the model as .bmp, .png, .jpg, .tif, with the Pro version also supporting .pdf, .eps, .epx, .dwg, and .dxf.

However, the free version of SketchUp does support Ruby scripts which has allowed many people to get around SketchUp's importing and exporting disabilities.

GPS location information is always stored in the KMZ file. The building designs themselves can be saved in SKP.