Both Reaper and Hydrogen are free and make a great combination for music production regardless of genre or operating system. Reaper is a slim but powerful digital audio workstation, and Hydrogen is an open-source sequencer.
Reaper is a highly recommended free music production program that is more versatile than many expensive digital audio workstations. Reaper is more suited to editing and laying out lengthy clips of audio samples into preferred sequences. Reaper is also a great workspace for mixing and mastering such sequences.
Hydrogen is an open-source drum machine and step sequencer. Hydrogen has an active user community constantly adding features to the application. Hydrogen is geared towards making unique drum loops out of short drum hits. These can later be exported and laid over a mix in Reaper.