D&D General What is available via OGL / SRD?

[wingsandsword]

You need to cite them properly, but you can always mine the SRD's for ideas and convert between editions.

There's a HUGE amount of material in the 3.5 SRD and the d20 Modern SRD that wasn't put into an OGL form for 5e, but you could convert it.

There's also Unearthed Arcana for D&D 3.5, which in that edition was a book almost entirely of adding options to the game via the OGL.

There's also some game elements in 5e that were put out as OGL that were never OGL in 3.x (Warlocks and Dragonborn come to mind, where both first appeared in splatbooks and were kept closed content at the time)

You can convert between them and mine them for ideas all you want, just cite them properly.

 

[see]

It happens that the original 3.0 SRD is still available from the original Open Gaming Foundation website, too.

As I see Aasimar in the 3.5 document, but its not in 5.1 for example, and Pathfinder has the Inner/Outer/Transitive Planes from what I can see, so are the Planes open game as well?

As far as planes, some but not all planes are mentioned in OGC somewhere. As a quick overview:

1) The 3.5 SRD Planes.rtf file has basics on the categories of Inner/Outer/Transitive, plus a bit more detail on the Material Plane, the Ethereal Plane, the Plane of Shadow, the Astral Plane, the Elemental Plane of Air, the Elemental Plane of Earth, the Elemental Plane of Fire, the Elemental Plane of Water, the Negative Energy Plane, and the Positive Energy Plane, while mentioning the existence of Outer Planes without detailing them.

2) The 5.1 SRD Appendix PH-C (pp.363-365 in the PDF) covers the Material Plane, Ethereal Plane, Astral Plane, Elemental Planes and Elemental Chaos. It mentions the existence of the Outer Planes, and says "The most well‑known Outer Planes are a group of sixteen planes that correspond to the eight alignments (excluding neutrality) and the shades of distinction between them."

3) The names of various planes not specifically detailed in the 5.1 SRD also show up here and there in that work in contexts that indicate they are planes. I believe they are the Feywild, Shadowfell, Beastlands, Arborea, Hades, Nine Hells, Mechanus, and Elysium, but there might be some others in such contexts somewhere in it.

4) The all-OGC 3.5 Tome of Horrors Revised includes the classic (that is, used in 1e) names of a number of the planes in the monster entries.

HOWEVER: The long-form Outer Plane names used in 2e Planescape (like "Nine Hells of Baator") and the city of "Sigil" are all declared Product Identity in the OGL 1.0a, and so cannot be used even if you find them in something that otherwise appears to be Open Game Content.

 

[wingsandsword]

As far as planes, some but not all planes are mentioned in OGC somewhere. As a quick overview:

The Far Realms are mentioned, at least in passing, in OGC.

The Pseudonatural creature template is described as "Pseudonatural creatures dwell between the stars, beyond the planes as we know them, or nestled in far realms of insanity."

It's also not in the list of things declared Product Identity in OGL 1.0, probably because the Far Realms were poorly explored in D&D lore when the OGL was released and only started to get more coverage in the 3e era.