SQLMachine is described as 'freeware, safe, scalable and adequate performance client-server side architectural SQL DBMS. (Database Management System)' and is an app in the Development category. There are more than 25 alternatives to SQLMachine for a variety of platforms, including Windows, Linux, Mac, Online / Web-based and BSD. The best alternative is PostgreSQL, which is both free and Open Source. Other great apps like SQLMachine are SQLite (Free, Open Source), MySQL Community Edition (Free, Open Source), MariaDB (Free, Open Source) and Microsoft SQL Server (Freemium).
PostgreSQL is a powerful, open source object-relational database system. It has more than 15 years of active development and a proven architecture that has earned it a strong reputation for reliability, data integrity, and correctness.
SQLite is a software library that implements a self-contained, serverless, zero-configuration, transactional SQL database engine. SQLite is the most widely deployed SQL database engine in the world. The source code for SQLite is in the public domain.
MariaDB is a backward compatible, drop-in replacement of the MySQL® Database Server. It includes all major open source storage engines. The source code for MariaDB is publically available from Launchpad. Binaries and packages are also available.
SQL Server delivers on Microsoft’s Data Platform vision by helping your organization manage your data by enabling you to store data from structured, semi-structured, and unstructured documents within the database.
Apache Cassandra has become the leading NoSQL platform driving many of today's modern business applications by offering continuous availability, high scalability and performance, strong security, and operational simplicity while lowering the overall cost of ownership.
Firebird is a relational database offering many ANSI SQL-92 features that runs on Linux, Windows, and a variety of Unix platforms. Firebird offers excellent concurrency, high performance, and powerful language support for stored procedures and triggers.
Cockroach is a distributed key/value datastore which supports ACID transactional semantics and versioned values as first-class features. The primary design goal is global consistency and survivability, hence the name.