A few options:. If you just want a drawing tool, take a look at. It's free but not open source. A more capable drawing tool is.
RazorSQL is an SQL Editor and SQL database query tool for Mac OS X, Windows, Linux. It supports MySQL, Oracle, MS SQL Server, SQLite, PostgreSQL AlternativeTo let you find new PC (Windows, Linux), Mac, iPhone, Android, Web/Online software based on applications you already know instead.
Not free but good. If you want a modelling tool rather than just a drawing tool, try. There is a free community version as well as paid-for professional/enterprise additions. There's also and in the modelling tool space. MagicDraw, Poseidon and VP are all comparable to Enterprise Architect. Not sure if they do ER diagram syntax though. I've used MagicDraw for several years on my mac and I'm very happy with it.
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For ER drawing is worth to check. It is an online database designer working under Chrome and Safari developed by company I work for. The most important feature of this tool is that it allow to share database models across the team and collaborate on them via web browser. Others Vertabelo features include:. Support for PosgreSql, MySQL, Oracle, MS SQL Server, DB2, SQLite, HSQLDB. Dynamic/Visual search.
Live database model validation. Model versioning.
Forward engineering. Reverse engineering Vertabelo is free to use for academic projects and have commercial versions for larger database projects.