I've started a crap ton of mods over the years, and finished none. The Core looks to be the one to change that, but I decided to think back to mods I've started and put them up here. Thought it might be interesting to see what you guys have done in the past as well.
I'm no coder, so a lot of them were simply map packs with new skins and models.
Mod: MCF
Details: This is the only one I can remember working on before I even game to TWHL. Set in a fictional city in the UK, the Morris Chemical Facility (MCF) was Gordon Freeman's next assignment by the GMan (This was long before HL2 was announced). During his first experiment with the MCF, a chemical leak was to create a series of mutant creatures which Freeman had to eradicate.
Reason for cancelling: No modelling ability, texturing with MS Paint. Then the mod Chemical Existance came out and shat all over my attempts at mapping. Just kinda gave up.
Mod: Kinetix
Details: Set in a fictional city in the UK, the Kinetix Labs were hastily established after an alien craft crash landed in a park. Under the guise of a simple plastic manufacturer, the underbelly of the complex housed the alien lifeform known as Kinetix. The player was to control an unnamed security recruit on his first day who was sensitive to the alien's telepathy. The alien would guide the player to him in an attempt to be released from his chamber. On top of this, the city was to be assaulted by a hostile alien race who were pursuing Kinetix for an unknown reason. There was even a terrible attempt at a trailer for this one. Following the release of The Core, this is probably the only past project I would consider revisiting.
Reason for cancelling: Started working on OiFH.
Mod: Half-Life: Off it's fucking head (HL:OiFH)
Details: A collaboration between myself, Tosse, Espen180 and Daubster under the label Demonic Puppy Games. This was simply a spoof mod with no real plot and ridiculous features. The very kind of mod I have come to loathe after a few years on moddb. The top 4 videos in this search for OIFH on Youtube are related
Reason for cancelling: Team kinda just fell apart after a while. Tosse and I considered starting a zombie mod in Source but this never got past the planning phase.
There are many many more but that's all I can think of at the moment...