Hello Emil,
Welcome to the forum.
You can certainly post libraries here. It is great to share code. (occasionally we have problems posting large files due to timeouts). If they are standards, like Irrlicht, then it is best just to provide links.
To keep the forum space under control, old attachments will be removed after around 12 months but we endeavour to retain completed projects and any material of lasting value.
The latest Oxygen is on the website: Alpha Downloads --> OxygenBasic.zip (in progress). This version is updated very frequently, often daily.
Charles