This is a free online blue box, red box, and silver box. No installation or administrative rights required!
Use the buttons below to play 2600 Hz, SF tones, MF tones, DTMF tones, and coin denomination tones. MF tones can also be played using the keyboard, as well as 2600Hz. Use K for KP, S for ST, and H for 2600 Hz.
Either alternative firmware or an app (it's not clear which) for the Flipper Zero which turns it into a white, blue, and red box.
ToneDef is a small, but powerful tone dialer application for Android featuring DTMF, blue box, and red box tone generation. Use the keypad, enter a predefined sequence, or select an entry from your contact list. F-Droid is currently the recommended way to install ToneDef.
A collection of useful information and tools pertaining to DTMF.
(Yes, the ending dash is supposed to be there.)
A Blue Box design that emulates classic Blue Box tones, plus 12 other historical tone modes. It produces 12 tone signalling systems used by phone phreaks to hack other more exotic system in the US and overseas, including early pre-cellular mobile telephone systems from the 50s, 60s, and 70s, including the classic bluebox and the DTMF suite. 12 memories of up to 32 tone sequences each. Sine waves from PWM.
Maybe make myself a con badge out of it?
The Test Call is the homepage of a free (and legal!) service that offers some telephony debugging services, such as echoback (say something, it records it and plays it back), DTMF identification, a 4KHz sweep for audio quality, and caller ID checking.