In another move to shore up its image, Yahoo announced today that it will hold a conference for mobile app developers on Feb. 19, 2015, in San Francisco. The conference, which will be free to attend, will feature the unveiling of a new suite of developer tools along with talks by app developers. The show will be focused on iOS and Android development, with a “State of Mobile” keynote address by Simon Khalaf, Yahoo’s Vice President of Flurry Products, headlining the event.