The hard cores and fiber streaks in the first 2 pics are caused by 3 different things either alone or interacting: stressful weather conditions such as big fluctuations in temps, excess fertilizer (primarily K), and variety (hybrids are less prone to the issue than open-pollinated varieties and beefsteaks slightly more prone than smaller fruit).

The 3rd photo is stink bug damage, a common tomato pest whose proboscis penetrates the skin of the fruit to suck out moisture and can only be controlled with pesticides.

Dave

Thanks, Dave. This summer can't decide if it's going to 100º or 70º. Gross on the stink bugs!