One of the goals of many international trade organizations is harmonization of law across national borders. Organizations like UNCITRAL and UNIDROIT have created Model Laws and Rules, which states may adopt and make part of their national law.
Federal Arbitration Act, 9 U.S.C. Sec. 101 et seq.
Arbitration Act 1996 (U.K.)
Private International Law 1987 (Swiss)
UNIDROIT Principles of International Commercial Contracts 2016 Note that these principles are a codification or restatement of contract law for international trade. As such, they are nonbinding, unless a state adopts them as part of its national law.
World Legal Information Institute (WorldLII) aims to provide free access to laws of all countries. It is worth exploring the WorldLII website as its coverage has expanded to include international decisions and articles. A recent project is its collection of national privacy laws in its Global Data Protection, Privacy & Surveillance Law Library.