In Europe (actually, pretty much everywhere except the US), aeronautical information is published in the ... wait for it... Aeronautical Information Publication (AIP). Such AIPs are sometimes divided into IFR and VFR.
Most European IFR AIPs are available from the
European AIS Database. You need to register but it's free. The AIPs have summaries of the applicable flight rules (in particular differences from ICAO standards) in the ENR and GEN sections.
AIPs are also available online.
The
UK AIP includes VFR and IFR, as does
France and
Belgium. Germany does not publish its VFR AIP free online (shame on you DFS!).