Dinner reservation app OpenTable has launched a tool to help grocery stores and other essential businesses deal with long lines and overcrowding. The company’s reservation software will now let you book available shopping times and even be put on waiting lists. The service is free. "Not only does this help control crowds in a simple and contactless way, it also provides a safer option for shoppers, especially those at high risk, to get their groceries without waiting in a crowded line,” OpenTable said in a press release. (KTVU)