Grisbi - Accounting for everyone !

Expensify - Import expenses directly from a credit card to create free expense reports quickly. Approve reports online and reimburse directly to a checking account with one click.

Ledger-cli.org - Ledger is a powerful, double-entry accounting system that is accessed from the UNIX command-line.

Abacus - Expenses without the 'expense report'

Gnuaccounting - Gnuaccounting is a Free Java cross-platform accounting and bookkeeping application. Features

Zoho Expense - Automate your expense reporting process and streamline the approval flow.