Latest debian buster kernel package (as of 2021-05-17) per kernel series:

5.10-ti         5.10.30-ti-r3
5.4-ti          5.4.106-ti-r29
4.19-ti         4.19.94-ti-r63
4.14-ti         4.14.108-ti-r141
4.9-ti          4.9.147-ti-r121
4.4-ti          4.4.155-ti-r155

5.10-ti-rt      5.10.30-ti-rt-r3
5.4-ti-rt       5.4.106-ti-rt-r29
4.19-ti-rt      4.19.94-ti-rt-r63
4.14-ti-rt      4.14.108-ti-rt-r141
4.9-ti-rt       4.9.147-ti-rt-r121
4.4-ti-rt       4.4.155-ti-rt-r155

5.4-ti-xenomai  5.4.106-ti-xenomai-r29
4.19-ti-xenomai 4.19.94-ti-xenomai-r63
4.14-ti-xenomai 4.14.108-ti-xenomai-r141
4.9-ti-xenomai  4.9.147-ti-xenomai-r121
4.4-ti-xenomai  4.4.113-ti-xenomai-r149

5.12-bone       5.12.3-bone13
5.11-bone       5.11.20-bone18
5.10-bone       5.10.35-bone33
5.9-bone        5.9.16-bone29
5.8-bone        5.8.18-bone33
5.7-bone        5.7.19-bone24
5.6-bone        5.6.19-bone19
5.5-bone        5.5.19-bone22
5.4-bone        5.4.115-bone49
5.3-bone        5.3.18-bone23
5.2-bone        5.2.21-bone18
5.1-bone        5.1.21-bone18
5.0-bone        5.0.21-bone19
4.20-bone       4.20.17-bone15
4.19-bone       4.19.190-bone65
4.18-bone       4.18.20-bone16
4.17-bone       4.17.17-bone15
4.16-bone       4.16.13-bone11
4.15-bone       4.15.15-bone4
4.14-bone       4.14.232-bone50
4.13-bone       4.13.16-bone3
4.12-bone       4.12.14-bone4
4.11-bone       4.11.9-bone3
4.9-bone        4.9.178-bone15
4.4-bone        4.4.145-bone23
3.8-bone        3.8.13-bone86

5.11-bone-rt    5.11.4-bone-rt-r13
5.10-bone-rt    5.10.35-bone-rt-r33
5.9-bone-rt     5.9.1-bone-rt-r12
5.6-bone-rt     5.6.17-bone-rt-r14
5.4-bone-rt     5.4.115-bone-rt-r49
5.2-bone-rt     5.2.20-bone-rt-r12
5.0-bone-rt     5.0.19-bone-rt-r15
4.19-bone-rt    4.19.190-bone-rt-r65
4.18-bone-rt    4.18.20-bone-rt-r16
4.16-bone-rt    4.16.17-bone-rt-r12
4.14-bone-rt    4.14.232-bone-rt-r50
4.13-bone-rt    4.13.16-bone-rt-r3
4.11-bone-rt    4.11.12-bone-rt-r3
4.9-bone-rt     4.9.178-bone-rt-r15
4.4-bone-rt     4.4.145-bone-rt-r23