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Top 5 C# Addin Projects
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NoteHighlight2016
Source code syntax highlighting for OneNote 2016 and OneNote for O365 . NoteHighlight 2013 port for OneNote 2016 (32-bit and 64-bit)
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ReSharper
ReSharper is now available in VS Code and Cursor. ReSharper brings a professional toolset for C# developers backed by over 20 years of experience, enterprise-grade security, SOC 2 compliance, and the trust of companies worldwide.
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RevitLookup
Interactive Revit RFA and RVT project database exploration tool to view and navigate BIM element parameters, properties and relationships.
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arcgis-osm-editor
ArcGIS Editor for OpenStreetMap is a toolset for GIS users to access and contribute to OpenStreetMap through their Desktop or Server environment.
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Git Diff Margin
Git Diff Margin displays live Git changes of the currently edited file on Visual Studio margin and scroll bar. Supports Visual Studio 2012 through Visual Studio 2022
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
C# Addin discussion
C# Addin related posts
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Do you think there are any practical / genuine benefits of using rich text in apps like in Microsoft Word, over markdown?
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TIL: No Search/Replace
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Is there a way to set a "read-later" or reading lists on Onenote?
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It's 2023 - why the heck do we still not have a way to merge table cells?
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book to one note
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Are any students here willing to help a total newbie to One Note? Just started using it for my notes.
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Adding a stopwatch ?
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A note from our sponsor - SaaSHub
www.saashub.com | 10 Jul 2026
Index
What are some of the best open-source Addin projects in C#? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | NoteHighlight2016 | 3,932 |
| 2 | OneMore | 3,344 |
| 3 | RevitLookup | 1,380 |
| 4 | arcgis-osm-editor | 426 |
| 5 | Git Diff Margin | 309 |
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ReSharper is now available in VS Code and Cursor
ReSharper brings a professional toolset for C# developers backed by over 20 years of experience, enterprise-grade security, SOC 2 compliance, and the trust of companies worldwide.
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