Top 4 C# Share Projects

ShareX

217 24,333 9.7 C#

ShareX is a free and open source program that lets you capture or record any area of your screen and share it with a single press of a key. It also allows uploading images, text or other types of files to many supported destinations you can choose from.

Project mention: What's a good, free, full-featured screen recording software? | reddit.com/r/software | 2023-05-29

ShareX
ScreenTask

1 676 10.0 C#

(📢 New Version Released) Screen sharing made easy! Share your screen across local devices without internet.

Project mention: Syncing up all the screens in my house | reddit.com/r/homelab | 2022-10-29

Also audio does not seem to be a part of screencast. It was asked in 2021, and has not been commented on in github. Maybe I missed something there.
ONLYOFFICE

www.onlyoffice.com
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ONLYOFFICE Docs — document collaboration in your environment. Powerful document editing and collaboration in your app or environment. Ultimate security, API and 30+ ready connectors, SaaS or on-premises
SuperGrate

1 100 0.0 C#

💾 Get moving with Super Grate; a free & open source Windows Profile Migration & Backup Utility. Super Grate is a GUI (Graphical User Interface) that assists Microsoft's USMT (User State Migration Utility) in performing remote migrations over a network connection.

Project mention: How can I change the user name folder here ? | reddit.com/r/Windows10 | 2023-05-15

It's a command line only utility, so it might be a bit much. Luckily there are more than a few GUI wrappers for it. The best free one seems to be Super Grate, with documentation available here.
Hikari

0 2 2.3 C#

Hikari is a custom logon script engine for Microsoft Windows OS, executed during user's logon in Microsoft Windows session. (by NoenDex)

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). The latest post mention was on 2023-05-29.