Need embedded database that supports multi-process read/write access

I need an embedded database that supports multi-process read/write access. Right now I'm using SQLite, but we want to move away from it because it's cumbersome to work around the disability to have multi-process write access.

After some research we found ScimoreDB Embedded.  This one looks to be a good candidate. There's one problem with it: although it seems to work great (according to my first tests), it's quite unknown with little information to be found on the web except their own website. Of course, that doesn't mean it's bad.

As I'm hesitated in using an unknown database like ScimoreDB, I'm still looking.

Therefore I still would like to hear some suggestions based on you own experience with those.

NB: The database must have support for .NET 4.0 (or higher).
Marc VBAsked:
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Marc VBAuthor Commented:
I'm developing mostly in VB.NET but some other projects in C#. The database must have a .NET API.
Marc VBAuthor Commented:
I've had contact with one of the two developers. This assured me that this is a good quality product which doesn't need much support (it's easy enough), but if needed they are available to help.

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