Brightcove, along with two other US penny stocks, are worth keeping an eye on according to Yahoo Finance. Penny stocks are those trading at a low price, typically under $5 per share. Brightcove, a video technology company, has shown promise in the market. Keeping an eye on these penny stocks can potentially lead to profitable investments. Yahoo Finance recommends monitoring Brightcove and the other two US penny stocks to stay informed on potential opportunities in the market.