Hi HN,I've built this new tool that helps property developers sell their units simultaneously and simplifies the generation of documents (sales offers/ purchase agreements etc ..) 
it has also some basic activity tracking, access control and import/export features.This was built using Flask, Vue/Vuetify, Postgresql, and websockets.I have multiple clients who are very happy with this service and decided to extend it further.Feel free to drop me any questions you may have.Demo link: 