Tools
There are a lot of useful tools the community has created to make it easier or even possible to extract the game files, parse them, mod the game...
HVP Unpacker
A lot of the game files are packed in several HVP files, in order to obtain the former you need to unpack the latter. There is more than one tool that can do that, let's check some of them.
obscure-hvp by YouKnow: This tool can not only unpack the HVP files from ObsCure and ObsCure II, but also the Wii and PS2 versions of Alone in the Dark (which uses the same as ObsCure II) and Final Exam. And it's made in Rust so Rustaceans will be pleased with this one :P.
HVFilePacker by Hydra: Can unpack and pack again ObsCure and ObsCure II HVP files. Made in python.
unhvp.exe by unknown: Can unpack at least ObsCure HVP files. It is unknown who made it. If you know, please tell me.
Texture tool
ObsCure Texture Tool by Hydra: It can unpack and repack DIC and DIP files from ObsCure and ObsCure II.
Model Importer and Exporter
ObsCure Model Importer and Exporter by Hydra: It can import and export ZWO, DIC and DIP file into and from Blender.
ObsCure
Save Game Manager (ObsCure)
ObsCureSaveGameManager by ELPiTiFOR: ObsCure only provides 10 slots to save the game, which is not enough for a lot of fans. This program lets you manage more than 10 savefiles, and also comes with some useful features like correcting the CRC32 checksum in case you manually modify the savefile.
File Parser (ObsCure)
ObsCureFileParser by ELPiTiFOR: The goal of this tool is being able to parse, modify and serialize a bunch of file formats ObsCure uses, like TM, IT, SAV and HOE (yes, there is a "hoe" file format).
Randomizer (ObsCure)
ObsCureRandomizer by ELPiTiFOR: This tool aims to provide a way to randomize items and monsters in ObsCure to give the game more variety. Right now, it only randomizes items, and some bugs are still to be fixed. Before completing this tool, more researches on the game files formats must be done.