Planitax, Inc.
- Corporate tax software offering integrated (or stand alone) suite of web based modules.
- http://www.planitax.com

TaxSation Inc.
- Corporate income tax software for preparing federal and state income tax returns, tax provisions (FAS 109), consolidations and IRS e-file.
- http://www.taxsation.com

TaxStream
- Specializes in corporate taxation and tax provisions software under FAS 109. Also offers data management and consulting services.
- http://www.taxstream.net/

CrossBorder Solutions
- Transfer pricing and international tax planning software.
- http://www.xbsolutions.com/

Vertex Inc
- Offers Fixed Asset Management, Income Tax, and Sales Tax software
- http://www.vertexinc.com/

Mikhea
- Sells Oklahoma Franchise Tax Suite to make filing your franchise taxes easier.
- http://www.mikhea.com/

TaxWise by Universal Tax Systems, Inc.
- Tax preparation and electronic filing software offering federal and state software packages for 1040, 1120, 1120S, 1065, 1041 ,706, 709, 990, 5500, and miscellaneous forms.
- http://www.taxwise.com/

PracticalTaxSolutions
- Offers software for corporate tax planning and compliance. Includes demo request.
- http://www.practicaltaxsolutions.com/

Taxsoftware.com
- Online business tax preparation software and electronic filing.
- http://www.taxsoftware.com/

Decision Modeling InterestNet
- Performs restricted interest computations and global netted interest computations for federal interest obligations.
- http://www.taxcomps.com/

1120S Accountant, Inc.
- IRS form 1120s software for Subchapter S corporation tax returns.
- http://www.1120saccountant.com/

Tax Dimensions
- Excel based corporate tax compliance and automation software for corporations.
- http://taxdimensions.com/

AcQuest Programming Solutions
- Publishes depreciation, tax penalty and interest, and Forms 941, 1120, and 1120S software.
- http://acquest-solutions.com/

CORPTAX LLC
- Personal and real property tax software product for corporate tax departments.
- http://www.corptax.com/

BNA Software
- Tax & Accounting Solutions for Software Professionals
- http://www.bnasoftware.com

CCH ProSystem fx
- ProSystem fx offers an extensive portfolio of tax compliance, planning, office management, and auditing software.
- http://www.prosystemfx.com/

Tax$imple
- Offers individual and business software used by CPA's, accountants and tax practitioners and online tax preparation and electronic filing.
- http://www.taxsimple.com/

Tax Technologies, Inc.
- Provider of Internet/Intranet-based tax compliance and planning solutions for Fortune 500 clients. Specialize in International tax.
- http://www.taxtechnologies.com/

Micro Vision Software
- Offers a complete range of products for tax and accounting professionals including Tax Relief and Accountants Relief.
- http://www.mvsinc.com

Tax Spread
- Free spreadsheet to calculate US Federal income taxes for both Microsoft Excel or Sun Microsystems StarOffice.
- http://anyway.8k.com/tax/

1120 Accountant, Inc.
- IRS form 1120 software for C corporation tax returns.
- http://www.1120accountant.com/