Client Tool for uploading files on server

Project Description: Currently, we are using an Adobe Air tool for sharing files, which allows our users to upload files thru it to the server. All these files can be access at the admin back-end. We are thinking to replace it with any other tools, which will work like that. So, we are looking for some freelancers or company, who can create a tool for client from where he/she can upload their files to the server with it, You need to develop a third party application ( you can use any technology which understands XML) to generate XML as per KnowledgeTree Hot Folders XML schema. But, we don't prefer to use .Net Technology here, as it will not work on MAC. So, suggest your way of developing the tool. or Please come forward who are ready to create a new tool, or who can customized Knowledge Tree Hot Folders. Allowed Time for delivery : 2 weeks. Price : $100 - $250