Ranked in these QuestionsQuestion Ranking
Pro Free and open source
LMMS is available for free with source code licensed under GPL and available on GitHub allowing anyone to edit and extend the software as they see fit.
Pro Has the possibility to become a great open-source alternative to FL Studio
-Interface look like FL Studio interface.
-Main workspace for composing and editing melodies and harmonies is piano roll.
LMMS works on Linux, Windows and OSX.
Pro VST Support
Uses VeSTige as the VST plugin. It has some bugs but most VSTs work with it.
Pro MIDI controllers support
Just plug in and play. Plug in the MIDI keyboard before opening LMMS and it'll automatically pick up that you've connected the keyboard.
Pro JACK Audio Connection Kit support
Pro LADSPA plugins support
LMMS is lightweight enough to be run off of a flash drive.
Pro VST plugins support
Pro Multiple languages support
Pro Works with many VSTs and effects
Pro Preloaded with basic VST instrument plugins and modifiers
LMMS comes with a triple oscillator, Gameboy sound emu, NES sound emu added into the software, which makes it easier to create sounds without the inclusion of external plugins. It is very accessible for beginners.
Con Program crashes a lot
This happens more frequently when loading VST files.
Con No merging or splicing options
There is no feature that allows you to merge or splice tracks in LMMS.
Con Pitch bending could be more native
Sometimes you can pitch bend with the Piano Roll Editor but with many instruments you cannot and are limited to the pitch knob in the main plugin interface.