The major characteristics of all such organizations is that they do party related work like general information about the ideological cause, training of volunteers, publication of pamphlets and international aid for democracy building (in co-operation with partners around the world).
The party political foundations receive 95% of their funding from government grants, thus blurring the definition of 'non-governmental organisation'.
All except the FNF and the DES are not legally registered as a 'foundation' but as a private “Verein” under german law.
[1] Similar institutions have also been organized in the Netherlands, Austria, France and Greece.
The same applies for the Netherlands Institute for Multiparty Democracy (NIMD).