Catalytic Chemical Vapor Deposition method is used to produce Tangled carbon nanotubes (CNTs), dispersible and short CNTs, aligned CNTs, & functionalized CNTs, having a wide variety of inside diameters, outside diameters, and dispersible lengths, functionized CNTs, short lengths, some dispersions, & industrial grades. Chemical (Co-) precipitation is used to produce Single- & multi-metal oxides, and rare earth oxides. Microemulsions are used for making oxides and compounds with precise control of small (5-10 nm) APS. Sol-Gel process is adopted for making narrow particle size range & aggregated nanopowders while wet chemistry procedure is made use of for making metallic nanopowders (W, Mo, Ta etc.), oxides, and carbides. High Pressure wet-chemistry is used for manufacturing metastable phase nano-particles. Electro-Explosion method is suitable for making metal and alloys of average particle size (APS) 60-100 nm. Hydrothermal method is adopted for preparing oxides, APS 20-80 nm (and larger, up to 300-500 nm). Plasma Vapor Deposition is employed for vapor, solid elements, metal(s) oxides, carbides, & nitrides etc and for specialty electronic nano-powders. Plasma Enhanced Chemical Vapor Deposition is a method normally used for more active particles, such as (1) metals: APS 25 nm and 60nm, 80nm, 120nm; (2) silicon, carbides, borides and nitrides: 99%, 99.9%, APS 5, 10, 30, 60, 200, 300, and 500 nm. Laser Induced Chemical Vapor Deposition procedure is employed for more active nanoparticles; Si, SiC, and oxides, APS about 10 nm, 50 nm and 100 nm, free from aggregation. For brittle powders, APS less than a few microns (and smaller, less than 100 nm) with no contamination Low Temperature Physical Method can be used while Mechanical Milling is suitable for making (1) brittle powders, APS down to 20 nm, (2) for breaking down aggregated nanopowders and tangled CNTs; (3) for agglomerating nanostructured metals, alloys, oxides, carbides, and their mixtures. Gas Jetting can be adopted for manufacturing brittle powders from nano- to submicro-meter scale.