| C# / CSharp Open Source |
| 2.6.4 mono .net core |
| Microsoft | System | System.CodeDom | System.Collections | System.ComponentModel | System.Configuration |
| System.Data | System.Diagnostics | System.DirectoryServices | System.Drawing | System.Dynamic | System.EnterpriseServices |
| System.Globalization | System.IdentityModel | System.IO | System.Json | System.Linq | System.Management |
| System.Media | System.Messaging | System.Net | System.Numerics | System.Reflection | System.Resources |
| System.Runtime | System.Security | System.ServiceModel | System.Text | System.Threading | System.Timers |
| System.Transactions | System.Web | System.Windows | System.Windows.Forms | System.Workflow | System.Xaml |
| System.Xml |
| 2.6.4 mono core |
| Ldap | mono |
| Aspect Oriented Frameworks |
| NKalore Compiler | Runtime Assembly Instrumentation Library |
| Bloggers |
| AtomSite | BlogEngine.NET | dasBlog | Mayando | SubText | tBlogger |
| TriptychBlog |
| Build Systems |
| BuildStudio | Byldan | CruiseControl.NET | Draco.NET | eAnt | NAnt |
| NAntContrib | NAntRunner | NET Pre Build | NETZ |
| Business Application |
| 32feet.NET | BurnOut | Chaos files extractor | DC | IsoCreator | MonoCalendar |
| Outlook Data Export | Quartz Enterprise Scheduler | SharePoint Manager 2010 | SkyDrive Simple Viewer for WebDAV | Slide.Show 2 | svchost viewer |
| T4 Toolbox | Tea Timer for Windows | Timetabler | Vista XP Virtual Desktop Manager | Windows 7 USB DVD Download tool |
| Charting Reporting Tools |
| EasyDiagram | fyiReporting | googlechartsharp | NPlot | SkyNET | ZedGraph |
| Chat Servers |
| Thresher |
| Code Coverage Tools |
| NCover | NCoverCop | PartCover |
| Content Management Systems CMS |
| Cube CMS | Cuyahoga | DotNetNuke | JMDCMS | Kooboo | mojoPortal |
| My Web Pages Starter Kit | N2 | umbraco | VWD CMS | XMLNuke |
| CRM ERP |
| Tustena CRM |
| Database |
| Berkeley DB | BIDS Helper | Data Access Objects | Data Tier Generator | MySQLDriverCS | NBearLite |
| Npgsql | SQL Power Injector | TDO |
| Development |
| AdblockIE | AIMLBot | Ajax.NET Professional | AODL | Asterisk | Be.HexEditor |
| Castle | Circle Dock | Command Line Option Parsing | devAdvantage | Dotnet IL Editor | DotNetLib |
| DotNetZip | EnvMan | Exocortex | Free language translator and file converter | HessianCSharp | Html Agility Pack |
| IKVM | iTuner | Jayrock | JSON Viewer | Json.NET | LitJSON |
| MMC | MouseExtender launcher for Windows | NDoc | NExcel | Nini | Paladin RAD Framework |
| Sandcastle | Sandcastle Help File Builder | ScintillaNET | SerialPort | Sinergia | Spring.NET |
| StyleCop | StyleCop for ReSharper | SubSonic | ThreadMessaging | Touchless SDK | TULP2G |
| u4n | Vici Parser | Vici WinService | Wangdera |
| DotNetOpenMail | SharpWebMail |
| Forum |
| YetAnotherForum |
| Game |
| Axiom 3D Engine | Balder | Brume | DirectShow | DotNETris | Farseer Physics Engine 3.0 |
| Killer Instinct | Media File XStream | MeWiG | PokDTC | PurpleSharp | Rawr |
| RealmForge | SDL | SokoSolve Sokoban | Space Trader | uMusic | WBFSSync |
| XNACommunity |
| GIS |
| DeepEarth | Geotools.Net | GMap.NET | Google Maps API Control | MsSqlSpatial | NetTopologySuite |
| Offline Maps | Proj.NET | SharpMap |
| GUI |
| AvalonDock | Cropper | CsGL | DockPanel | Duplicate images finder | FOP |
| Gimp | LongBar | NPOI | Paint.net | Paint.NET PSD Plugin | SBar Taskbar Replacement |
| SharpVectorGraphics | SourceGrid | SwfDotNet | Taskbar Meters | TreeViewAdv | VidCoder |
| Windows Double Explorer | wx NET |
| IDEs |
| MonoDevelop | SharpDevelop |
| Installers Generators |
| NInstall | WiX |
| Inversion of Control Dependency Injection |
| Autofac | Castle | ObjectBuilder | Spring.net | StructureMap | Winter.NET |
| Issue Tracking |
| BTsys | BugTracker.NET | ekon |
| Logging Tools |
| Common.Logging | CSharp Dot Net Logger | log4net | Logger.NET | LogThis | NLog |
| Performance Analysis of Logs PAL Tool | TraceTool |
| Message |
| RabbitMQ |
| Mobile |
| Droid Explorer | mSeller |
| Network Clients |
| Alchemi | CxBrowser | Desktop Google Reader | DICOM | Dot Net FTP Client | Dot Net Telnet |
| DotNetControlExtender | edtFTPnet | Facebook Developer Toolkit | fileSync | Fluent.Toc | FreeMeter |
| Ftp4net | GibPhone | Granados | GROF | iCalendar | Indihiang |
| iReaper | IZWebFileManager | Jabber Net | LiveUpload to Facebook | LiveUpload to YouTube | Metro |
| MiniTwitter | MSNP Helper API | NagMIN | NC Net | NET LOGGER | net policy |
| Net Statistics | NetAr | NetSpell | Newsreader | NGrid | nHapi |
| OpenSmtp.net | RemoteCalendars | SharpDownload | SharpPcap | SharpPrivacyLibrary | SharpSSH |
| SmartIrc4net | Smilla .NET | SNMP Observer | TBDEV | TweetSharp | Virtual Router |
| VNC Client | Windows TFTP Utility | Woofy | youtubeFisher |
| Network Servers |
| CSharp Email Server | FTP.NET | NeatUpload | netBPM | NMail | WebDAV.NET Server |
| Office |
| BibWord |
| ASP.NET FO PDF | iTextSharp | PDF Clown | PDFsharp | SharpPDF |
| Persistence Frameworks |
| Advanced Data Provider | BATIS.NET | BBADataObject | csopf | D4Modelizer | Data Holder |
| FileHelpers Library | Habanero | iBATIS.NET | NEO | NHibernate | ODX |
| OR.NET | ORM.NET | Ormyx | Persist.NET | Sisyphus Persistence Framework | Ubik |
| Vici CoolStorage |
| Portals |
| Media Portal |
| Profilers |
| Prof It |
| Project Management |
| Personal Task Manager |
| RSS RDF |
| Aggie | Atom.NET | FeedExpress | GtkSharpRSS | iPodder | mail2rss |
| NRss | RSS Bandit | RSS Feeder |
| Rule Engines |
| Drools.NET | NxBRE | SRE |
| Script |
| Dynamic Language Runtime | IronPython | IronRuby |
| Search Engines |
| dotLucene | NLucene | openDICOM |
| Sound Audio |
| OpenSebJ | SharpFFmpeg | Skype Voice Changer | Text2Speech |
| Source Control |
| DotSVN | NetCvsLib | Porc |
| SQL Clients |
| Database Commander | SQL Buddy |
| Template Engines |
| iCodeGenerator | netTiers | NVelocity | StringTemplate.NET |
| Testing |
| csUnit | Dot NetUnit | dotunit | EasyMock.NET | MockObjects | NETUnit |
| NUnit | NUnitAsp | NUnitForms | Rhino.Mocks | SystiN | TestDriven |
| XT Unit | xUnit.net |
| UML |
| MonoUML |
| Web Frameworks |
| Community Kit for SharePoint | Creuna Platform | CSS Friendly Control Adapters | Enterprise Library patterns and practices | Ingenious MVC | Maverick.NET |
| MvcContrib | Nerddinner | nopCommerce | Orchard | Oxite | Silverlight Toolkit |
| TailspinSpyworks | TheBeerHouse | Vici | Visual WebGui | Web Client Guidance | Websharp |
| Web Service |
| MantisConnect | Web Service Software Factory |
| Web Testing |
| IeUnit web testing framework | NUnitAsp | WatiN | WET |
| Wiki Engines |
| Perspective | ProntoWiki | Thufir |
| Windows Presentation Foundation |
| Bluetooth Radar | Caliburn | Fluent Ribbon | MVVM Light Toolkit | Snoop | Windows Presentation Foundation |
| WPF Dynamic Data Display |
| Workflows |
| NetBpm | NServiceBus |
| XML Parsers |
| DINAMIC XML Editor | NDigester | SAX for NET | SAX.NET | XML Explorer |