SilverStrike is a Django webapp that you can use to manage your finances. Tries to make finance management easy. Heavily influenced by Firefly-iii (in particular the UI; both use AdminLTE) but tries to add some new features and leave out some less useful ones. Specifically supports multiple users accessing the same budget, i.e., a household. Supports multiple kinds of transactions (not just bill). Written in Python, uses Django. Has a REST API.
A company that integrates with banks and financial institutions and provides an API when said institutions don't. Some fairly prominent companies seem to use them (Betterment, Venmo, Coinbase, Fanny Mae, AmEx). Intended for helping users budget, manage payments, and bookkeeping.
A web application made to ease shared budget management. It keeps track of who bought what, when, and for whom; and helps to settle the bills. Written in Python, uses a database (MySQL, Postgres, SQLite) as its back-end. Can be installed as a first-class Pip module. Has a REST API, of course.
A self-hosted financial manager. It can help you keep track of expenses, income, budgets and everything in between. It supports credit cards, shared household accounts and savings accounts. It’s pretty fancy. You should use it to save and organize money. Does double-entry bookkeeping. Can interface with some banking APIs.