AdamWhite 

A univariate, sparse, symbolic, BigInteger polynomial arithmetic class.

Arbitrary precision decimal class

Arbitrary precision rational number class.

Arbitrary precision complex numbers

Data first or code first ORM. Entity-object-class-poco to SQL repository mapping, and vice versa. Data to C-Sharp class code or emit assembly. Can dynamically generate assemblies, C-Sharp code, and SQL scripts for CREATE TABLE, INSERT, and UPDATE.