Vararuci’s Prākr̥taprakāśaḥ, the earliest Prakrit grammar to survive (maybe 8th century?):
Cowell, Edward Byles (ed.). The Prákrita-Prakáśa, or, the Prákrit Grammar of Vararuchi, with the Commentary (Manoramá) of Bhámaha. Hertford: Austin, 1854. [With the commentary of Bhāmaha, called Manōramā; available at Internet Archive.]
Sharma, Batuk Nath, and Baladeva Upādhyāya (eds.). The Prākṛita Prakāśa of Vararuchi with the ‘Sañjīvanī’ of Vasantarāja and the ‘Subodhini’ of Sadānanda. Allahabad: Government Press, 1927. [With the commentary of Vasantarāja, called Saṁjīvinī; available at Internet Archive: Part I; Part II (alternative scan).]
Candra’s Prākr̥talakṣaṇam:
Hoernle, A. F. Rudolf (ed.). The Prákṛita-Lakshaṇam or Chaṇḍa’s Grammar of the Ancient (Ársha) Prákrit. Calcutta: Baptist Mission Press, 1880. [Available at Internet Archive.]
Hemacandra’s Siddhahēmacandraḥ, completed in the 1150s:
Pischel, Richard (ed.). Hemacandra’s Grammatik der Prâkritsprachen. Halle: Waisenhaus, 1877. [Available at Hathi Trust (alternative scan)]
Vaidya, P. L. (ed.). Prakrit Grammar of Hemacandra, being the Eighth Chapter of his Siddhahemacandra. Poona: Hanuman Press, 1928. [Available at Internet Archive.]
Puruṣōttama’s Prākr̥tānuśāsanam:
Nitti-Dolci, Luigia (ed.). Le Prākṛtānuśāsana de Puruṣottama. Paris: Société Asiatique, 1938.
Trivikrama’s Prākr̥taśabdānuśāsanam:
Vaidya, P. L. (ed.). Prakrit Grammar of Trivikrama with His Own Commentary, or Prākṛta-Śabdānuśāsanam Savṛttikam. Sholapur: Jaina Saṁskṛti Saṁrakṣaka Saṁgha, 1954. [Available at Internet Archive.]
Siṁharāja’s Prākr̥tarūpāvatāraḥ:
Hultzch, E. (ed.). Prakritarupavatara, a Prakrit Grammar based on the Valmikisutra. London: The Asiatic Society, 1909. [Available at Internet Archive.]
Premodern Lexicons
Dhanapāla’s Pāiyalacchī, completed in 972:
Bühler, Georg. (ed.) The Pâiyalachchhî Nâmamâlâ: A Prakrit Kosha by Dhanapâla. Göttingen: Peppmüller, 1879. [Available on Internet Archive.]
Hemacandra’s Dēśīnāmamālā, completed in the 1150s:
Pischel, Richard, and Georg Bühler (eds.). The Deśînâmamâlâ of Hemachandra. Bombay: Department of Public Instruction, 1881. [Available at Hathi Trust.]