DragonTree spellbook is a compendium of new spells: Lawrence Schick wrote "Supplement of 224 spells, with two new types (Dragon Magick and Zero Level spells), and rules for four magic systems." Heroic Worlds.
THE Fighter is a set of combat options for fighters, mostly being an alternative combat system.
DragonTree Spellbook has a range of spells of all levels that go from interesting, to really good, to useless. For example some of the 2nd level spells like Record (basically just records your voice) would be better as a cantrip. rpggeek.com/rpgitem/63921/dragon-tree-spell-book
T.H.E. Fighter is a very old school approach to making combat more complicated than it needs to be. It feels like a prelude to Man-to-Man and GURPS. RPG Geek has a decent listing rpggeek.com/rpgitem/107985/the-fighter
These are the first three spells in the Dragon Tree Spell Book (1981). It is interesting that these zero level spells came out before the Dragon magazine that introduced cantrips to D&D, which was #59, Mar 15, 1982.
ASSAY COMPOUND (ALCHEMIST) (BRE) ZERO LEVEL Save: N/A Comp: V/S Dur: INSTANTANEOUS Range: TOUCH This is used to determine the nature of drugs and herbs. The degree of information revealed depends on the users.familiarity with the type of compound being investigated. If a mage attempts to use this spell on a drug or herb which he has not previously encountered, ~e will n~t gain any information. If he has previously tested a sample of the same material, knowing what the material is, he will be able to identify the sample.
This spell is used to determine the composition of metals. The material component is a hard white stone called a touch stone. When the spell is cast, the sample metal transfers a characteristic mark to the stone by which the experienced metal worker can recognize the composition of the sample.
BAIT (DS) ZERO LEVEL Save: NONE Comp: V/S Range: TOUCH Duration: 24 HOURS Area: 1 CUBIC INCH
This spell causes any small object to smell and taste like the favorite food of any named species of animal (Caster must know the proper name of the species). If the true name of an individual (animal or person) is used, it will seem like that individual's favorite food. (To everyone it will smell and taste like his favorite; to him only, it will also look like it).