1. Invoicera

Invoicera is a clean online invoicing and billing app with a spartan time tracking ability which enables you to share your project from its different evolution stages to your clients in a diligent manner. It offers an array of added functionality like multi-language and currency support, data safety, multiple payment gateways, expense tracking and also synchronises with Google apps. With all these offerings, it’s not heavy on your wallet either (starts from $0 to $99 max). It’s truly worthy to use Invoicera to experience something more than invoicing.

2. FreshBooks

FreshBooks provides a nifty way to manage your clients with an automated payment reminder. With support for almost all popular currencies, it offers speedy online cash transactions and Google Chrome users also get some great FreshBooks apps/extensions. Though it offers a free account, the paid packages are a mere $19.95/month away.

3. CurdBee

If you consider your hectic business billing process a necessary evil, then CurdBee can be a breather with its intuitive and simple invoicing process. (Personally, I use this for all my billing tasks.) It offers users with some essential invoicing features like estimation, one-click recurring profile handling, time tracking all gathered within a clean interface. Convert your approved estimates within an invoice with a single click and it will slice down expensive hours breakdown by projects. An user can avail all these without spending a single buck by signing up for regular account or pro packages that are available for $5 to $20 per month.

4. Siwapp

Siwapp is an open source web app to create and manage invoicing online in a hassle free manner gratis. It’s easy to edit, search and list invoices on dashboard in a slap-up style. The best part is that it can automate generating invoices on a periodic basis with a unique serial number every time. With a printable PDF invoice feature, it wraps up a professional perspective. A growing community of developers are continuously contributing to uplift the functionality of Siwapp to make it a better tool.

5. Harvest

Are your business clients a bit low on financial standing or late on sending payments? If “yes”, then Harvest can help you with a unique feature of automating recurring pending invoice reminders. If you are a project manager and using Harvest, you are surely going to love the two most newly added features Team Status & Recent Tasks. They help you quit the hassle of asking your team. Pricing is flexible from $12 to $90 per month and a 10% discount is offered if you upgrade to a yearly plan. This might not be the best bang for your bucks, still it’s worth a try.

6. Sage Billing Boss

If the cluttered interface of your online invoicing tool is draining the last bit of your energy, then Sage Billing Boss might just be the comfort you are seeking for a long time. A normal user can create and send his first invoice with a couple of clicks using Sage Billing Boss. It integrates with popular payment gateways with features like recurring invoicing, quotes, online payment tracking and also collaborates with your accountants for better and faster business operations. With an existing 256 bit AES encrypted data transmission process, it can earn you a carefree sleep.

7. PHP Invoice

If you possess one of these professional identities – webmaster, freelancer or developer – and are looking for a versatile online invoicing software, then PHP Invoice is the right door to knock. With an unique integrated online shopping cart from where you can sell your product directly and immediately. It also offers HTACCESS and HTPASSWD for advanced page protection, automated advanced notifications, ticket support for better communication, announcements for your organisation and more. It’s free and easy to download, while professional versions are available with added benefits.

8. Zoho Invoice

Zoho Invoice is a simple yet elegant online invoicing service where users can choose and customise invoicing templates to their liking. If time saving is your foremost priority, then it has the ability to top the list as you can create new estimates and invoices by cloning similar ones; you don’t have to start from scratch every time. Create new invoices by a single click from estimates, brand it with your company logo, track and follow up your expenses. It offers easier currency conversions. You can import customer’s information from standard formats like Outlook Express and Zoho CRM. The tool has plenty more to offer. The pro version is valued at $30 a month, but you can opt for a free account as well.

9. Invoice Bubble

Invoicebubble is a free online invoicing software perfect for small businesses and freelancers. The invoicing application integrates with Paypal and offers most basic features for online invoicing with a professional hint. Sign up for a free account and start invoicing.

10. Greenerbilling

Greenerbilling lets you create and manage invoices and estimates in a fairly simple manner with a nifty user interface. It accepts PayPal payments, automates the scheduling of your invoices, clones invoice from similar ones, creates downloadable PDFs for datasheets, estimates, manages client profiles and also provides a round the clock effective customer support. The branding perspective is also not neglected in this simple yet robust billing tool. There are notable names like Simple Invoice, Invoice Machine or Paypal’s inbuilt invoicing tool and a dozen more that can possibly handle the task like the ones mentioned here. However, to the best of my knowledge, these (ones included in the list) are the ones I can assure of being worthy of making the billing process an easy task for you.