Rules, Regulations and Forms

Federal Acquisition Regulations (FAR) - http://farsite.hill.af.mil/

Although the FAR is the primary rulebook for acquisition regulation, each agency may issue supplements to the FAR. To name a few: 

Defense Federal Acquisition Regulations (DFAR)(201.1-253.303) http://www.acq.osd.mil/dpap/dars/dfarspgi/current/index.html

General Service Administration Acquisition Regulations (GSAR)(501.0-570.7) https://www.acquisition.gov/gsam/current/html/Part501.html

National Aeronautics Space Administration Regulations (NASFAR) http://www.hq.nasa.gov/office/procurement/regs/nfstoc.htm

Code Of Federal Regulations (CFR) and Department of Defense Grant and Agreement Regulations (DoDGARs) 

The Code of Federal Regulations (CFR) is the collection of the general and permanent rules published in the Federal Register by the executive departments and agencies of the Federal Government. It is divided into 50 titles that represent broad areas subject to Federal regulation. Each volume of the CFR is updated once each calendar year and is issued on a quarterly basis.

Code of Federal Regulations (CFRs) https://www.ecfr.gov/cgi-bin/ECFR?page=browse

Code of Federal Regulations/Labor (CFRs) http://www.dol.gov/dol/cfr/

DoD Directives (DoDGARs) http://www.dtic.mil/whs/directives/

Government Forms

DOD Forms http://www.dtic.mil/whs/directives/infomgt/forms/index.htm

GSA Forms Library http://www.gsa.gov/portal/forms/type/TOP