The provided URLs do not directly link to a company named "Praxis" at http://www.praxis.tech or http://www.linkedin.com/company/praxis-tech-ltd. However, based on the name "Praxis," it generally refers to companies that focus on practical applications of technology or expertise. For instance, Praxis Engineering offers software and system engineering solutions, Praxis LLC specializes in Salesforce services, and Praxis Precision Medicines develops novel therapies. Each company targets different audiences and offers unique services. Without specific details from the URLs, it's challenging to pinpoint the exact services or unique selling proposition of the company in question.