I have create BLite a Document embedded database
Zero-alloc embedded DB for .NET, but SQLite bindings already dominate this niche.

Embedded document store that actually enforces foreign keys and nested transactions.
.NET developers building domain-heavy applications without a full server DB
LiteDB · RavenDB · Entity Framework
Zero-alloc embedded DB for .NET, but SQLite bindings already dominate this niche.
Sparse matrix graph operations with MCP server integration for AI agents.
Per-actor SQLite eliminates single-table DynamoDB pain—real schema flexibility at scale.
First public NRC regulatory embeddings dataset—37K chunks ready for ChromaDB and Pinecone.
GraphDB for agents with schema enforcement—clever idea, but early and positioning unclear.
NeDB compatibility in pure Go; a nicer SQLite.js for terminal apps.