MyFitnessPal is a nutrition tracking app whose official figure puts the food database above eighteen million items, reachable by search, barcode, camera or voice; a free account already logs meals, exercise and weight.

A single watchlist that holds American, European and Asian listings side by side, with charts, earnings dates and a news feed attached, at no cost and with no account required to look.

A finance portal that grew into an app: mainland quotes, funds, futures and global indices in one place, with a busy investor community beside the numbers. Free, and clear about what a tool cannot decide for you.

Spendee draws your spending as rings and trend lines instead of a column of numbers, keeps separate wallets for cash and cards, and lets a partner add to the same ledger. Free tier is enough to start.

Most attempts at tracking expenses fail for one reason: the tool is too heavy. AndroMoney removes the obstacles one by one, with one-screen entry, three fields, recurring transactions and reports that answer the question directly.

A professional terminal costs more per year than most people save, which is why individual research often stops at a spreadsheet. Koyfin puts the dashboard, the filings and the peer comparison in a browser, and the free tier covers the core work.

Goodbudget turns the oldest budgeting trick into software: split income into envelopes at the start of the month, subtract every purchase from the matching envelope, stop when it is empty. No bank connection, one shared ledger for the household, and the free tier covers ten envelopes and two devices.

Habitica wraps habits, dailies and one-off to-dos inside a role-playing game: finish something real, earn experience and gold, level the avatar up, and join party quests where a slacking teammate costs everyone health. Core features stay free and the code stays open.

Weather Underground builds its picture from hundreds of thousands of personal weather stations reporting in real time, so temperature, wind and rain are measured within a few kilometres of your door. Free for the core forecast and map, with a cheap subscription for extended outlooks.

Google Calendar is the shared ground of online scheduling: a free account carries the full core, the web and both mobile systems stay in sync, bookings that arrive by mail become entries on their own, invitations land with one reply, and time zones line up side by side.

A free expense tracker for Android, iOS and the web, built by an independent developer and published with its code visible. It offers five ways to sync, from the system cloud to WebDAV, S3 or a self-hosted backend, so the ledger lives on storage you picked rather than on someone else's server.