Differential Geometry Library includes over 580 objects for differential geometry and its applications. Moreover here is 380 Exact Solutions of Einstein's Field Equations. The formulas are represented in different forms: metric from, Contravariant Newman–Penrose Tetrad, Covariant Newman–Penrose Tetrad etc. Resource provides copyable formulas of the objects in different formats such as MathML for web-based articles, TeX for education or research works and Mathematica® and Maple™ input for calculations. Hope it will be useful!