Octobat is the easiest way to generate invoices online. See https://www.octobat.com for details.

Convert numbers and currencies to text in Greek and English. Usefull where a full text number representation is needed as in cheques and invoices.

This gem provides invoice management with imported time slices from the Timetrap gem.

Gem to interact with NFEdoBrasil SOAP API. Enables creation, consultation and import of invoices.

CFDI Mexico, To generate XML files from invoices of Mexico, Comprobantes Fiscales Digitales por Internet

Create invoices with Easybill

Html based, ie client side, printing for orders. Different styles are invoice, packing slip and receipt (for receipt printer in shop). Easy to configure and adapt

Invoice generators, etc.

Ruby gem for communicating with the kojn.nl API. Allows you to create and managed invoices.

A project manager that keeps track of a working directory, archive and template files. Used in commandline tools like ascii-invoicer.

綠界電子發票串接用SDK

Generates invoices using command line based on yaml file

Helps generate monthly invoices with weekly activity summaries

This is a Ruby API client for Mavenlink. Mavenlink's project collaboration suite allows you to manage your business relationships, share files, and track project activity online from anywhere in the world. Within a project workspace in Mavenlink, you can agree on budget & schedule, track time, s...

Reads hours from a Google Spreadsheet and generates a PDF invoice.

PDF invoice generator by ubity UG (https://ubity.io).

If you use Harvest for timekeeping, you can use this gem to create status reports from your entries. Ensure your clients see activity that matches your invoices. Use this gem to generate client-specific status reports. As freelance developer, I provide weekly status reports to m...

Full stack accountancy solution for rails: accounting / invoice model, pricing, gateways, reports, html2pdf view

Gem for generating pdf documents.

= Paperless-to-Xero A simple translator which takes a CSV file from Mariner's Paperless receipt/document management software and makes a Xero accounts payable invoice CSV, for import into Xero. Formatting in Paperless is very important, so you probably want to wait until I've written the docs