With savethenet.today you can send a physical, snail-mail letter to your congress person in support of net neutrality for $1.50. The cost solely goes to postage, server costs and Stripe payments.
Quirk is an open source, slimmed down CBT app for iOS. Unlike other apps, it doesn't force a particular condition on you. It doesn't assume that you're using it particularly for depression, which makes it useful for panic disorder, OCD, weight loss and more.