PDF Tools
34. PDFeditYou don't have to purchase expensive Adobe software in order to make modifications to existing PDF files. PDFedit lets you edit text, delete and renumber pages, add markup and more. Operating System: Windows, Linux.
35. Sumatra
This alternative to Adobe Reader boots up fast and offers a very simple interface. In addition to PDF files, it also reads XPS, DjVu, CBZ and CBR files. Operating System: Windows.
Project Management
36. OpenProjDownloaded more than 1.5 million times by users in over 100 countries, OpenProj is a very popular free alternative to Microsoft Project. Supported reports include Gantt, PERT, WBS (work breakdown structure), RBS (resource breakdown structure), Earned Value costing and other charts. Operating System: Windows, Linux, OS X.
Security
37. UntangleIf you're reasonable technically savvy, you can download the Untangle Lite software and use it to create your own gateway security appliance out of an old PC. It includes anti-virus, anti-spam, anti-spyware, phishing protection, OpenVPN, a firewall, intrusion prevention and more. If you're less technically savvy, the company also offers paid versions of the software that add more features and support. Operating System: Linux.
38. Endian Firewall Community
Endian offers the same gateway security functionality as Untangle. You can download the community version to use a PC to create your own appliance, or you can purchase a pre-configured appliance that comes with support. Operating System: Linux.
39. ClamWin
If you're not on a network, ClamWin can provide good antivirus protection for a single system. It boasts more than 600,000 active users. Simply right-click on a file to scan it or use the scheduler to plan a full scan of your entire system. Operating System: Windows.
40. KeePass
Using the same password all the time is dangerous, but remembering multiple passwords can be difficult. KeePass offers a solution—an encrypted database that stores all of your passwords. All you have to remember is one master password. Operating System: Windows.
Time Tracking
41. eHourIf you bill clients for work performed by the hour, eHour makes the process easy. You can track multiple clients, multiple projects, multiple workers and assign multiple hourly rates. It comes in both a standalone version for a single system or a server version for your network. Operating System: Windows, Linux, OS X.
Web Site Development
42. JoomlaPowering 2.7 percent of all the websites on the Web, this Web content management system is both very popular and very easy to use. Paid support and paid hosting are available on the site. Operating System: Windows, Linux.
43. Drupal
Extremely flexible, Drupal powers both very large sites filled with Web apps and very small blogs. It includes more than 10,000 modules and more than 1,000 themes to help you create your website. It's also the content management system used by the White House. Operating System: Windows, Linux.
44. Nvu
Calling itself the "#1 free Web authoring system," Nvu aims to make it easy to design your own Web pages. For newbies, the site also explains how to get your own Web domain and has links to Web hosting companies. Operating System: Windows, Linux, OS X.
Utilities
45. BleachBitBleachBit speeds up your system and protects your privacy by cleaning out your cache, erasing your Internet history, and deleting cookies, temporary files, logs and other unnecessary files. It also includes a file "shredder" that completely eliminates all traces of deleted files. Operating System: Windows, Linux.
46. PNotes
This fast and lightweight app lets you leave yourself virtual sticky notes on your desktop. It also offers features like scheduling, audio notes, encryption, password protection, tabs, smilies, transparency and more. Operating System: Windows.
47. Electric Sheep
When you have this app running on your system, your computer will communicate with thousands of other systems around the world to create interesting abstract animations. Vote for your favorite animations, and they'll live on longer. The name comes from Philip K. Dick's novel Do Androids Dream of Electric Sheep. Operating System: Windows, Linux, OS X.
48. Really Slick Screensavers
If you're looking for a screensaver that's a little bit out of the ordinary, check out Really Slick. It includes a dozen different colorful (and sometimes nausea-inducing) screensavers. Operating System: Windows.
49. Eraser
It's not enough to delete sensitive files from your system—in many cases they can be recovered with forensics tools. However, Eraser can "shred" your files by writing over them with random data so that they cannot be recreated. Operating System: Windows.
50. Darik's Boot And Nuke
If you're getting rid of an older PC from your home office, make sure you completely erase the hard drive before donating it or throwing it away. Start up your computer with a Darik's Boot and Nuke disk in a drive, it will destroy all the information you had on all of the drives in your system. Operating System: OS Independent.
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