Suggester is described as 'tool to assist in the creation of songs and chord progressions. This app will help you find chords that work together. It is efficient and fun; use it to build musical phrases that will carry emotion through tension and release' and is an app in the Audio & Music category. There are eight alternatives to Suggester for Windows, Mac, iPad, iPhone and Linux. The best alternative is Impro-Visor, which is both free and Open Source. Other great apps like Suggester are Scaler (Paid), Instachord (Paid), Chord NOTE (Paid) and Midi Madness (Paid).
Impro-Visor (short for “Improvisation Advisor”) is a music notation program designed to help jazz musicians compose and hear solos similar to ones that might be improvised. The objective is to improve understanding of solo construction and tune chord changes.
Scaler is the inspirational MIDI effect that makes finding chords and progressions intuitive and fun! With note detection, scale selection and chord suggestions, Scaler is a comprehensive but easy-to-use toolbox that will help anyone make better music.
Instachord is a MIDI Processing Plugin that helps you play chords and chord progressions faster and easier. Find the chords that work well together and build a perfect chord progression for your next song with just a few clicks.
Midi Madness 3 can create an unlimited number of melodies using a simple set of probability weightings. Simply set some parameters, such as a chord sequence and some MIDI controllers, and let Midi Madness go wild, creating melodies, chord progressions and sequences.
Described as chord sequencer it lets you quickly create chord progressions, play them in many styles, transpose, adjust tempo, change instruments. Great for practicing. I used it for improving my scales on guitar and I have to tell it is amazing.
Chordjam is an innovative plugin that builds chords and progression patterns through intuitive user-guided randomization. It automatically randomizes a unique combination of parameters, serving up unpredictable but always-musical variations.