Steam 'n' Rails (Removed due to another server-side bug which I was unable to fix.)
Sodium Options API (Incompatible with the new Sodium / Reese's Sodium Options versions. Sodium Dynamic Lights depend on it to configure it via the video settings; but because Sodium Options API is incompatible, you can't access it that way and it's useless for now.)
Other
Updated existing mods.
Also, I'm working on a server-side pack so you can open a server yourself and play it with your friends! Which is also why I removed Steam 'n' Rails.
As to why this is 0.5 and not 0.4.7 or something like that; I wanted to add all the mods (gem alert) and updates in a single version, but then all the work needed grew so much I split it into a few updates. In the previous versions I focused more on the mod side, and now I tweaked all the configs and small things. Some of those small things are still missing, but they are the reason the pack is in beta.