For larger wires, like 2/0 of 4/0, the tool I use is the T&B TBM6 w/ appropriately-sized dies, as-shown in these images. This is a high-quality, heavy-duty tool that is very versatile, w/ many different die sets available for different crimp applications.
For medium sized crimp, from 2 AWG to 8 AWG, the tool I use is the Molex 64001-3900D Crimp Tool. This is a high-quality, heavy-duty tool that provides an excellent crimp.
The tool I use for right angle flag crimp connectors, from 22 AWG to 14 AWG is the Panduit CT-300-1 Crimp Tool.
For the standard red / blue / yellow crimp connectors, for 22 AWG to 10 AWG, I use the Xcelite ECP-100 Crimp Tool.
For medium sized crimp, from 2 AWG to 8 AWG, the tool I use is the Molex 64001-3900D Crimp Tool. This is a high-quality, heavy-duty tool that provides an excellent crimp.
The tool I use for right angle flag crimp connectors, from 22 AWG to 14 AWG is the Panduit CT-300-1 Crimp Tool.
For the standard red / blue / yellow crimp connectors, for 22 AWG to 10 AWG, I use the Xcelite ECP-100 Crimp Tool.