Administration Software Ltd
Provides time and expense tracking and billing, and practice management software for firms providing professional services.
http://www.Practice-Administration.com/

BQE Software
Makes BillQuick, time and billing software for attorneys, engineers, architects, contractors and other professional consultants.
http://www.bqe.com

CLIP Software
Software package for the service industry to automate routing, scheduling, billing, job costing, and more.
http://www.clip.com/

Davis Business Systems Ltd.
BS/1 accounting, distribution and manufacturing software with Delphi source code for programmers. Free single-user version.
http://www.dbsonline.com/

eCHARGE
Alternative payment method that allows Internet users to shop online and securely "charge" items to their local phone bill.
http://www.echarge.com/

ImagineTime
Offers time, billing, and practice management solutions designed by CPAs for the accounting world.
http://www.imaginetime.com/

Intell-a-Check
Windows based check writing application designed to create checks payable to your company drawn on the accounts of your customers.
http://www.icheck.com/

invoiceit! - invoicing software
All-in-one business software combining invoicing, quotations, cashbook accounting, diary, direct mail/e-mail and more - intuitive design makes it easy to use.
http://www.scrambled-card.com/

Make It Work
Database design and hardware solutions. Custom invoicing and billing systems designed for companies of all sizes.
http://www.makeitwork.com/

MessagingDirect
Provides electronic statement delivery software for billing and other confidential documents.
http://www.messagingdirect.com/

Netvantage, Inc.
Offering payment, remittance, and check processing, as well as cashiering hardware and software.
http://www.netvantage.net/

Protech
Makes Probill Plus, recurring billing software, for Windows.
http://www.probill.com

Studio 848, Inc.
Developers of Bill Power, time and billing software.
http://www.studio848.com

TimeWin
Allows you to track your billable time across multiple clients, projects, and tasks. Thunder Creek Software.
http://www.thundercreek.com/

Upside Software
Provides web-based solutions for electronic billing, contract management, and expense claim management.
http://www.upsidesoft.com/