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Feelings wheel if you haven't seen it--there are lots of versions out there but this is a nice detailed one. Helps me pin down more precise versions of the Great Big Central Emotion I'm having.
...which I then note down in CBT Diary (Android). It's very simple but it's been helpful that the first two things I have to fill out are "event" and "body sensation," before I even attempt to name what I am feeling, because a BIG part of my work right now is identifying emotions before they become overwhelming. I've never been able to notice the buildup before--it felt instantaneous, but it's not. I just didn't notice the sensation of becoming angry, for instance. (Also it lets you mark down and rate the strength of all the things you're feeling about the event! And you can add your own, so naturally I stuck "abandoned" and "lonely" in there. :p)
If I'm already overwhelmed I use DBT 911 (also Android) because it's also very simple, and no matter how far gone I am, I can still operate my phone! (As evidenced by me blowing up my ex's phone with texts a...few...times. A lot of times. Um.) I'm now to the point where my phone feels like a safe, comforting thing when I'm starting to lose it, so I don't even have to try to convince myself to open the app; I know it will help me so I do it automatically. Anyway, THIS app lets you create your own crisis plan, practice DBT skills, and do exercises to ground you. When I don't have a person to lean on, the app does what I need.
I've also enjoyed Pacifica (I think it has other platforms but not sure), which is a mood-tracking app in which you can also track things like sleep and whether you exercised/ went outside/ saw a friend/ played with your pet/ took your meds. This is how I identified that not getting enough sleep almost invariably predicts that I will have a bad mental health day the next day. I've started putting a lot more emphasis on getting enough sleep.