TeamViewer is a remote desktop software that connects any PC, mobile, and server to each other globally. Licensing fees range from $49-$199/month.
Trello is a project management solution that helps users organize their tasks via boards, lists, and cards. Prices range from $0–$20.83+/user/month.
Slack is a team communication and collaboration app that helps users streamline their workflows. Prices range from $0 to $15+/user/month.