Docs4Lawyers is an open source document management solution created specifically for law firms, based on ECM software from Alfresco. Downloadable in vmware format with documentation and community portal.
plutext enables people to collaborate on a docx document at the same time (like Google Docs). plutext is delivered as an Alfresco module. Sourceforge hosts our VMware developer's appliance (Ubuntu's Jeos 7.10, Xfce, Eclipse) also inc docxj and docx4all