Here is a list of many national government agencies in the Philippines and their websites. This is not exhaustive, but covers many of the major agencies and sites.

Office of the President https://op-proper.gov.ph/

Department of Budget and Management https://www.dbm.gov.ph/

Office of the Vice President http://www.ovp.gov.ph

Department of Budget and Management (DBM) https://www.dbm.gov.ph

Department of Education (DepEd) https://www.deped.gov.ph

Department of Energy https://www.doe.gov.ph

Department of Environment and Natural Resources (DENR) https://www.denr.gov.ph

Department of Finance (DOF) https://www.dof.gov.ph

Department of Foreign Affairs (DFA) https://dfa.gov.ph

Department of Health (DOH) https://www.doh.gov.ph

Department of Human Settlements and Urban Development http://dhsud.gov.ph

Department of Information and Communications Technology (DICT) https://dict.gov.ph

Department of the Interior and Local Government (DILG) https://www.dilg.gov.ph

Department of Justice https://www.doj.gov.ph

Department of Labor and Employment (DOLE) https://www.dole.gov.ph

Department of Migrant Workers https://www.dmw.gov.ph

Department of National Defense (DND) https://www.dnd.gov.ph

Department of Public Works and Highways (DPWH) https://www.dpwh.gov.ph

Department of Science and Technology (DOST) https://www.dost.gov.ph

Department of Social Welfare and Development (DSWD) https://www.dswd.gov.ph

Department of Tourism (DOT) https://www.tourism.gov.ph

Department of Trade and Industry (DTI) https://www.dti.gov.ph

Department of Transportation (DOTr) https://dotr.gov.ph

National Economic and Development Authority (NEDA) https://neda.gov.ph