Links

Software

Piano From Above - Mostly used MIDI player on the community.
Synthesia - Mainstream piano roll software/MIDI player, often used by YouTube creators, paid.
Synthesia (9.0) - Latest free version of Synthesia.
Ultralight MIDI Player - Alternative to PFA, made with Java. Can be used for rendering MIDI files.
Zenith - MIDI renderer, made with C#, alternative to UMP.
Kiva - MIDI player, alternative to PFA.
mmidi - Lightweight MIDI player.
Toms's MIDI Player - Lightweight MIDI player.
PianoFall - Physics-based MIDI player.
MIDITrail - 3D MIDI player.
Embers - MIDI player from Unreal Engine. Alternative to Synthesia but looks professional.

OmniMIDI - Most optimized for playing Black MIDI. Also works for general players.
VirtualMIDISynth - Was most used before OmniMIDI used, good alternative.

Keppy's MIDI Converter - Convert MIDI files to MP3, WAV, or OGG.
Keppy's Note Generator - Render MIDITrail-like counter.
Simple AF Converter - Mostly used for merging MIDI files.
Simple AF Overlap Remover - Remove overlaps on MIDI files.
MidiNoteThreshold - Remove notes above the velocity threshold.
ImageToMidi - Converts image to a MIDI file. Good for making arts.
CJC Toolbox - Link to Discord server. A toolbox that includes CJC MIDI Counter Generator, CJC Overlap Remover, and CJC Advanced MIDI Merger. Seperate softwares are also in the Discord server.

Domino - Free MIDI editor in Japanese. Use Domino English Translation or other translations.
FL Studio - Professional DAW, often used on the community.
Anvil Studio - Good for loading multi-channel tracks. Freemium.
Audacity - Basic audio editor. Open source.