1. Microsoft Visual Studio – SharpDevelop, MonoDevelop
2. Web Development IDEs – Eclipse, Aptana
3. Microsoft .NET Framework – Mono
4. Microsoft SQL Server – MySQL, PostgreSQL, FireBird
5. Microsoft Project – OpenProj, Open Workbench
6. Microsoft Visio – Dia, StarUML
7. Microsoft Publisher – Scribus
8. Microsoft Office – OpenOffice
9. Microsoft Office Outlook/Outlook Express – Evolution / Mozilla Thunderbird
10. Microsoft Exchange Server – Zimbra, OpenXchange
11. Microsoft SharePoint – Alfresco, Deki Wiki, DotNetNuke, PHPNuke
12. Mercury LoadRunner – OpenSTA
13. Adobe Flash – OpenLaszlo
14. Adobe Acrobat – PDFCreator
15. Adobe Photoshop – Paint.NET, CinePaint, GIMP, GIMPShop
16. Adobe Illustrator – Inkspace
17. Adobe Premier/After Effects – Avidemux / Jahshaka
18. BusinessObjects Crystal Reports – JasperReports, DataVision, OpenRPT
19. Microsoft Dynamics – SugarCRM
20. Microsoft Money / Quicken – GNUCash, Grisbi
21. MindManager – FreeMind
22. WinZip – 7zip
23. Beyond Compare (File/Directory) Comparison – WinMerge
24. CodeSmith (Easy Code Generator) – MyGeneration
25. Icon Editor – IcoFX
26. FTP Client – FileZilla

There are much more than this list is available. But this is a start to remove on famous proprietary software from your arsenal.

As my previous post on SharpDevelop explained, SharpDevelop in many ways a better alternative to Visual Studio. However, the significant differences between these two and the advantages or disadvantages over each other are explained here.

Advantages of SharpDevelop over Visual Studio:

1. Open Source (Full Source Code available freely)
2. Completely Free to use for both Commercial and Personal use
3. Supports all .NET Framework, Compact Framework, WinForms (with excellent extra GTK# for X-Window based systems), Console Application, Direct3D (wow, Game Development anyone?), WPF, and Windows and Web Services.
4. Supports additional languages like Boo, F#, ILAsm and Python (very good)  out of box apart from C# and VB.NET.
5. Supports Installer Creation (a very likable feature works better than VS in my opinion)
6. Light on Resources and faster on Building (refer Point 8 below). The last time I checked, has only 80 KB of RAM with 0.x% CPU Usage even after opening a bulky WinForms project and keeping couple of forms open in design mode. (A relief from VS’s usual 128 KB or more RAM and 4-5% CPU Usage)
7. Inbuilt Re-factoring Engine (you’ll need the paid software JetBrains ReSharper if you want this in Visual Studio)
8. Parallel Build support for Multi-core machines (faster building, very likable feature which is sadly not available in VS as of 2005)
9. Supports important Visual Studio add-ons like FxCop, StyleCop, NUnit, PartCover etc.
10. Version Controlling with Subversion (which is far better a solution than VSS. I’ll post another post soon explaining the benefits of SVN over VSS. You can of course use AnkhSVN to get this in Visual Studio though.)
11. Wide range of very useful Add-ons (as the case with most Open Source projects)
12. Inbuilt Documentation Generator (Sandcastle, SHFB)
13. Very likable Class Diagram and Code Coverage views
14. Very likable F# Interactive, Boo Interpreter and Python Console
15. Supports Mono (the alternative .NET 2.0 Framework for Linux, BSD and Mac OS X)

What I see as disadvantages of SharpDevelop:

1. Code Editor has some minor glitches (I’ve seen some glitches on code folding and unfolding though it’s just visual not physical)
2. Lack of VSS Support (though I’m not looking forward to it as it’s a proprietary version control system to be included in any open source project like this)
3. Lack of Visual Studio like Object Browser (I miss that one here, though #Develop has very good Class Browser)
4. Somewhat Buggy (I’ve seen it crashing sometimes but understandable due to its Open Source nature)

But apart from this, programmatically speaking, you can do everything that you can do in VS with #Develop. It’s pretty impressive for a Open Source project.