Collections of legislation:

Collection of legislation  - current amounts and regulations to be promulgated
Collection of Laws and Collection of International Treaties - official release of the collections on the website of the Ministry of the Interior

Constitutional authorities:

Chamber of deputies - search for parliamentary press
Senate - documents and legislation
Government - current agendas and records

State Administration:

Justice- portal of the Ministry of Justice, Commercial Register, Civil Code
Ministry of Labour and Social Affairs
- Calculator of sickness insurance benefits - calculation of sickness, nursing and maternity benefits
- Pension calculators, pension reform calculator
Portal of Ministry of Labour and Social Affairs  - integrated portal of the Ministry of Labour and Social Affairs - employment, EURES
The office of personal data protection
State Labour Inspection Office - checking compliance with labour law and occupational safety regulations
Czech Chamber of Commerce - commenting on legislation
Czech Social Security Administration  
Labour Office- contacts to individual labour offices, information on vacancies

Courts:

Constitutional Court - decision-making
Supreme Court - search for decisions
Supreme Administrative Court - decisions and opinions

Defence against discrimination:

Ombudsman - protection against discrimination
Eliminating Discrimination - the European Commission's site on discrimination and defending against it
LGBT - legal and psychological counselling 
Discrimination, equal opportunities - legal advice
Consumer Defence Association - anti-discrimination helpline

Others:

Association for the Development of Collective Bargaining and Labour Relations
EPRAVO - articles, court decisions, practical advice
eLAW.cz - law, case law, model contracts and submissions
Health and Safety at Work - up-to-date information in the field of Health and Safety at Work

International:

EUR-Lex - access to European Union law
ECJ - European Court of Justice
Euroskop - all about the Czech Republic's membership in the European Union
IBA - International Bar Association
EELA - European Employment Lawyers Association
BusinessEurope - Confederation of European Businesses
UEAPME- European Association of Professional, Small and Medium-sized Enterprises
European Commission- Employment, Social Affairs and Equal Opportunities