Wavemaker Software, which offers open source visual tools for web development, has raised $4.5 million in a new round of venture funding. Hummer Winblad Venture Partners, Worldview Technology Partners and Sippl Investments all participated.

The San Francisco startup has created an Ajax development platform based on the Spring, Dojo and Hibernate open source projects. Its offerings include both a free version and a premium enterprise license.

Roger Sippl of Sippl Investments, previously chief executive of Informix Software, is joining Wavemaker’s board.