BQE Core is an Engineering/Architecture focused project management, time/expense tracking, CRM, Accounting, and invoicing platform. It's expensive, but I got sick of shoe-horning generic and cheap software into the way I was trying to run and bill projects. I think it's only slightly more than Quickbooks the way I have it configured. But I can upload a PDF of a proposal (they have a native proposal builder, but I can't get it to work right with the integration), store it in the software, and then send it to DocuSign to fill out signatures and email to the client. I'm paying $20/month for DocuSign.