If you missed out on tickets to Apple's Worldwide Developers Conference (WWDC) - and since they sold out in three minutes, it's quite likely you did - you may be soothed by news of a second Apple-centric conference in San Francisco going on at the same time. Appsterdam on Thursday announced AltWWDC, a free conference it will open just a block away from the Moscone Center where WWDC is held.Related StoriesMicrosoft prevails in Xbox patent rift with Motorola MobilitySamsung profits soar on phones, tablets; high hopes for Galaxy S4